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If you own a Honda Civic Si, keeping the intake tract and valves free of oil-rich vapors matters for performance and long-term reliability. A properly chosen Honda Civic Si oil catch can traps crankcase and PCV oil before it reaches the intake, reducing carbon buildup and maintaining throttle response over time. This guide covers our shortlist of the best options that fit the Civic Si engine bay and PCV routing, and explains the criteria we used to evaluate build quality, fit, and ease of installation.Read on to understand the practical benefits, installation considerations, and maintenance needs so you can pick the right catch can kit for your driving style and long-term goals.
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Top Picks at a Glance
| Best Quality Built to a higher standard if you want something more solid | Boomba Racing Stage 1 Oil Catch Can Kit for 2022+ Honda Civic Si |  |
| Best Value The sweet spot between price and what you get | Boomba Racing Stage 1 Oil Catch Can Kit for Honda Civic Si |  |
| Best Budget The cheapest option that still gets the job done reliably | PQY Universal 2-Port Baffled Oil Catch Can with Drain Valve |  |
| Highest Rated A top-rated pick with lots of positive feedback | Mishimoto Baffled Oil Catch Can for Honda Civic 1.5T (2016+), Black |  |
| Most Popular A crowd favorite that many people choose with confidence | EVIL ENERGY 300ml Baffled Oil Catch Can Kit with NBR Hose |  |
| Best Seller A high-volume bestseller chosen again and again | EVIL ENERGY Baffled 300ml Universal Oil Catch Can Kit |  |
1. Boomba Racing Stage 1 Oil Catch Can Kit for 2022+ Honda Civic Si
| Compatibility | 2022+ Honda Civic Si (11th Gen) |
|---|---|
| Product Grade | Performance Part |
| Filtration | Two-stage filtration |
| Capacity | 350ml |
| Material | CNC machined 6061 aluminum |
The Boomba Racing Stage 1 catch can kit mounts to the passenger strut tower and integrates with the Civic Si CCV to trap oil vapor and moisture before it reaches the intake. It uses CNC machined 6061 billet aluminum for a durable, machined housing and a two-stage filtration system to improve oil separation while remaining compact enough for a tidy engine bay. Installation is user-friendly: the kit includes a custom bracket, pre-cut hoses, and a quick drain valve with dipstick so routine servicing is simple and fast. With a 350 ml capacity it provides sensible storage for aggressive street driving and occasional boost without requiring tuning. As a Stage 1 unit it collects less than more aggressive setups, so drivers seeking maximum oil capture under sustained high-boost racing may prefer a larger Stage 2 solution. The kit is vehicle-specific, so fit and finish match the Civic Si layout and maintain a factory-quality appearance under the hood.
Best for: Buyers who prioritize preserving intake and valve cleanliness while keeping a neat, factory-quality installation on a 2022+ Civic Si and who want an easy-to-service performance part.
Less Ideal for: Drivers who plan frequent high-boost track sessions or need maximum oil capture should consider larger capacity or Stage 2 systems instead.
- Vehicle-specific design for direct fit to 2022+ Civic Si CCV layout
- CNC machined 6061 billet aluminum construction for strength and a clean appearance
- Two-stage filtration system for improved oil and moisture separation
- Includes custom bracket, pre-cut hoses, and quick drain valve for easier installation and maintenance
- 350 ml capacity is modest compared with larger Stage 2 catch cans for track or high-boost use
Verdict: A compact, vehicle-specific Stage 1 catch can that offers durable construction and easy installation to protect intake valves on the 2022+ Civic Si.
2. Boomba Racing Stage 1 Oil Catch Can Kit for Honda Civic Si
| Compatibility | 2016+ Honda Civic Si 1.5T |
|---|---|
| Capacity | 350 ml |
| Material | CNC machined 6061 aluminum |
| Filtration | Two-stage |
The Boomba Racing Stage 1 catch can is a vehicle-specific kit built to intercept crankcase blow-by on 2016 and newer Honda Civic Si 1.5T engines. It installs using a supplied bracket on the passenger strut tower and connects to the factory CCV plumbing with the included hoses and fittings, so no tuning is required. The billet 6061 aluminum can and two-stage filtration separate oil vapor and moisture into a 350 ml reservoir, and the quick drain valve plus dipstick make routine servicing straightforward. Because this is a Stage 1 unit it is sized and tuned for reduced collection compared with larger Stage 2 setups, which keeps weight and packaging compact while still limiting carbon buildup during spirited driving and boosted conditions. The kit’s vehicle-specific fit and complete hardware simplify installation, but drivers seeking maximum oil capture for heavy track use may prefer a larger-capacity or aftermarket multi-baffle option. For everyday spirited street driving and occasional track sessions this catch can offers durable construction and practical maintenance features.
Best for: Buyers who want a durable, easy-to-install catch can that reduces intake contamination on a Civic Si used for spirited street driving and occasional boosted or track runs.
Less Ideal for: Drivers planning sustained high-boost track use or extended racing sessions who need maximum oil separation and larger storage capacity.
- Vehicle-specific design with custom mounting bracket and pre-cut hoses for simplified installation
- CNC machined 6061 billet aluminum construction for durability and clean appearance
- Two-stage filtration and 350 ml reservoir effectively separate oil vapor and moisture
- Quick drain valve and dipstick make inspection and servicing fast
- Stage 1 capacity collects less oil than larger Stage 2 units, so it may require more frequent emptying under heavy use
Verdict: A compact, vehicle-specific Stage 1 catch can that gives Civic Si drivers a durable, easy-to-service way to reduce intake valve contamination during spirited and boosted driving.
3. PQY Universal 2-Port Baffled Oil Catch Can with Drain Valve
| Capacity | 1.5 Liters |
|---|---|
| Material Type | Aluminum |
| Fit Type | Universal Fit |
| Fuel Type | Gasoline |
This PQY two-port catch can is a compact, budget-friendly solution for reducing oil and blow-by deposits in the intake system. Built from 6061 aluminum with a black coating, it uses a baffled chamber and a 50 micron bronze-style filter to separate oily vapor and collect it in the reservoir. Typical use is inline with the PCV/vent plumbing where it intercepts crankcase vapors and stores condensate until you drain it. The adjustable mounting bracket and included CNC fittings make placement flexible in tight engine bays like the Civic Si, but hoses are not included so you must source appropriate vacuum hose and sealant. The bottom drain or supplied plug makes emptying straightforward, though some users report the quick-drain valve may need thread tape or trimming to stop leaks and fully evacuate fluid. Also check thread sizes before ordering replacement fittings since some reviewers found the listed thread spec did not match. For a low-cost, compact can that actually captures oil and keeps the intake cleaner, this is a practical choice if you are comfortable with minor fitment tweaks.
Best for: Cost-conscious DIYers who want to reduce intake oil contamination on a daily-driven Civic Si and are willing to handle basic hose routing and minor fitment adjustments.
Less Ideal for: Owners who want a vehicle-specific, plug-and-play kit with guaranteed thread compatibility or those running high boost engines without venting and proper pressure management.
- 6061 aluminum construction with black coating offers durable, low-weight build
- Baffled design and 50 micron filter reduce oil and blow-by entering the intake
- Compact body and adjustable bracket suit tight engine bays
- Included drain plug and optional quick-drain valve simplify emptying
- Hoses are not included so you must buy and fit compatible vacuum hose and sealant
- Some users report mismatched thread sizing and minor leaks from the drain valve
Verdict: A compact, affordable baffled catch can that effectively traps oil for cleaner intake plumbing on a Civic Si if you are comfortable sourcing hoses and making small installation tweaks.
4. Mishimoto Baffled Oil Catch Can for Honda Civic 1.5T (2016+), Black
| Compatible Vehicle | 2016-2021 Honda Civic 1.5T and Si |
|---|---|
| Material Type | Aluminum, Silicone |
| Capacity | 1.5 liters |
| Filter | 50-micron bronze filter |
| Mounting | Application-specific bracket included |
The Mishimoto catch can installs as a direct-fit, two-port baffled separator for the 1.5T Civic and Si to trap oil and protect the intake tract from blow-by. It uses a billet 6061 aluminum canister sealed with Viton O-rings and a 50-micron bronze filter plus an internal air diverter to increase turbulence and improve oil separation. The kit includes an application-specific bracket, direct-fit silicone hoses, fittings and clamps to simplify installation, which most users report takes about 30 to 60 minutes. In practice this reduces oil deposit buildup on intake valves and gives a visible place to check for blow-by during maintenance. The can is fully serviceable so filters and internal parts can be cleaned or replaced. Downsides reported by some users include potential fitment differences on newer model years that required minor hose modifications and a few cases where incorrect installation or leaks affected drivability. Expect periodic draining and inspection as part of regular maintenance rather than a set-and-forget part.
Best for: Buyers who prioritize long-term engine reliability and want a factory-like, vehicle-specific solution to reduce intake valve carbon and oil contamination on turbocharged 1.5L Civics.
Less Ideal for: Drivers who want a truly maintenance-free part or who are uncomfortable checking and servicing an added crankcase component during routine service should consider alternatives.
- Vehicle-specific direct-fit design for Honda Civic 1.5T and Si simplifies installation and gives a factory-integrated appearance
- Billet 6061 aluminum construction with Viton O-rings and machined finish for durability and a serviceable build
- 50-micron bronze filter and internal air diverter improve oil separation compared with simple inline traps
- Includes application-specific bracket, silicone hoses, fittings and clamps so no extra parts are required for most installs
- Some users on later model years reported needing to modify hoses for a proper fit
- A few reports link installation issues or leaks to drivability problems, so careful sealing and routing are required
Verdict: Choose this Mishimoto baffled catch can if you want a durable, vehicle-specific install that helps protect intake components and supports long-term engine reliability.
5. EVIL ENERGY 300ml Baffled Oil Catch Can Kit with NBR Hose
| Capacity | 300 Milliliters |
|---|---|
| Fit Type | Universal |
| Hose length | 2.6 ft (0.8 m) |
| Hose ID/OD | ID 3/8" OD 2/3" |
| Inlet/Outlet thread | M16×1.5 |
This EVIL ENERGY catch can is a compact, universal baffled separator intended to trap oil and moisture before they re-enter the intake via the PCV system. It is typically mounted inline with PCV hoses or used as a vent on pre-PCV setups; the removable baffle and included steel wool boost coalescing so you collect condensate and oil droplets instead of letting them foul intake ports. The kit includes a 300ml aluminum can, an NBR fuel hose rated for heat and wear, M16x1.5 threaded ports, basic mounting bracket and clamps. In practice it is easy to install on many engine bays and keeps throttle bodies and intake runners cleaner, which is valuable for high-revving or tuned Civics that are sensitive to intake gunk. Downsides to expect are occasional fitment fiddling for neat bracket placement, short hose length for some layouts, and small O-rings that can be tricky during assembly. Also in very cold climates the seller warns increased moisture can freeze so more frequent checks are needed. For a Civic Si this provides a direct way to reduce intake contamination without major modifications.
Best for: Buyers who prioritize protecting the engine from intake oil contamination and want a cost-effective, tangible way to reduce carbon buildup on a Honda Civic Si without heavy modification.
Less Ideal for: Drivers who need a vehicle-specific plug-and-play kit with guaranteed bracket fitment and exact hose lengths or those unwilling to do minor trimming or buy extra hose and clamps.
- Baffled design with removable baffle and steel wool improves oil separation and reduces intake gunk.
- Aluminum 300ml tank is compact enough to fit tight engine bays while offering a usable capacity.
- Includes heat- and wear-resistant NBR hose and necessary threaded fittings for secure connections.
- Solid machining and durable fittings give a factory-replacement feel at a lower price point.
- Bracket and hose lengths are universal and may require modification or extra hose for a clean Civic Si install.
Verdict: A compact, well-made baffled 300ml catch can that gives Civic Si owners an affordable, effective way to cut intake oil contamination when you are willing to adapt mounting and hose routing.
6. EVIL ENERGY Baffled 300ml Universal Oil Catch Can Kit
| Capacity | 300 Milliliters |
|---|---|
| Fuel Type | Diesel |
| Fit Type | Universal |
| Hose length | 2.6ft (0.8m) — ID 3/8 inch |
| Inlet/outlet thread | M16×1.5 |
This EVIL ENERGY baffled 300ml catch can is a compact, universal kit that separates oil and moisture from crankcase vapors before they re-enter the intake. It installs in the PCV/CCV line using the included NBR hose, clamps and an M16x1.5 threaded inlet/outlet; the removable baffle and supplied steel wool increase coalescing surface area so droplets collect in the tank rather than passing through. Practical benefits for a Civic Si include reduced intake valve and throttle-body gumming and cleaner intake runners, which matters on direct-injection and high-revving engines. The aluminum can and machined cap feel sturdy and the dipstick makes servicing straightforward. Limitations are the universal fitment approach: the short 2.6 ft hose and basic bracket may require routing work or additional hose/clamps for a tidy install in tight Civic Si engine bays, and in freezing conditions the seller warns about weekly cleaning to avoid moisture freeze. For a risk-averse buyer the unit offers clear, verifiable function with common-sense servicing needs rather than complex electronics or tuning changes.
Best for: A Civic Si owner who wants a conservative, proven way to reduce intake contamination and preserve engine cleanliness without tuning changes, and who prefers a straightforward, serviceable aftermarket part.
Less Ideal for: Buyers seeking a vehicle-specific plug-and-play solution with exact-fit brackets and long pre-cut hose lengths or those unwilling to perform basic routing or add small hardware items.
- Baffled internal design with removable baffle and steel wool improves oil and moisture separation.
- Solid aluminum construction and machined cap for durable, serviceable hardware.
- Includes NBR hose known for heat and wear resistance and basic mounting hardware.
- Dipstick and clear servicing procedure make inspection and draining simple.
- Universal kit may need extra hose, clamps, or simple bracket modification to fit neatly in a Civic Si engine bay.
Verdict: A compact, well-built baffled catch can that gives Civic Si owners a low-risk, serviceable way to cut intake oil contamination with minimal modification.
Choosing the Right Honda Civic Si Oil Catch Can: Key Factors to Consider
Fitment and Mounting
Correct fitment is critical because the Civic Si engine bay has limited free space and specific PCV hose routing. Confirming that mounting brackets and hose lengths match the Civic Si layout reduces the chance of rubbing, kinking, or interference with nearby components. A mount that uses existing bolt holes or unobstructive brackets makes installation easier and keeps the can secure under vibration.
Also consider the can orientation and drain placement. A can that requires frequent emptying should have a convenient drain or remote drain option positioned to be reachable without removing other parts. Poorly placed mounts can make routine maintenance more time consuming and increase the risk of missed service.
Material and Corrosion Resistance
Materials determine longevity when exposed to oil vapors, road salt, and heat. Aluminum or stainless steel bodies resist corrosion and handle engine-bay temperatures better than plated or low-grade metals. Anodized or powder-coated finishes can add protection, but coating quality varies.
Check the compatibility of internal components and fittings with common fuels and oils. Low-quality seals or fittings may degrade over time, causing leaks or vacuum issues. For a Civic Si that sees spirited driving, prioritize components built to withstand repeated thermal cycles.
Internal Separation Design
How the can separates oil from vapor affects both capture efficiency and service interval. Baffles, mesh filters, and coalescing surfaces help condense and collect oil droplets before they reach the intake tract. Simpler single-chamber designs may offer less separation and require more frequent draining.
A serviceable internal design that allows inspection and cleaning is advantageous. Replaceable or washable elements extend usable life and make it easier to verify performance. For owners who track or boost their engine, a more effective internal design reduces the risk of oil entering the intake under high crankcase pressure.
Hose Connections and Sealing
Secure hose connections prevent vacuum leaks and oil blow-by that could affect engine performance. Look for high-quality hose fittings, clamps, and properly sized barbs that match OEM PCV hose diameters. Push-fit or quick-connect styles can speed installation, but confirm they maintain a tight seal under thermal cycling.
Good sealing also matters for vacuum balance. A leaky connection can create an unmetered air path or alter crankcase evacuation behavior, which on the Civic Si may show up as rough idle or check-engine indications. Ensure replacement hoses are rated for oil exposure and engine heat.
Drain Access and Maintenance Frequency
Maintenance practicality influences long-term ownership satisfaction. A catch can that is difficult to access or empty will likely be neglected, eroding the benefits. Consider how often the can needs draining based on internal design and your driving habits; spirited driving tends to generate more oil condensate.
Convenient threaded drain plugs, quick-disconnect drain hoses, or visible sight gauges make routine service easier. Also evaluate whether the can needs complete removal for servicing or if it can be emptied in place. Ease of cleaning and inspecting internals reduces the chance of clogging or performance loss over time.
Impact on PCV System and Engine Behavior
A catch can alters the PCV flow path and can affect crankcase ventilation dynamics. It is important that the can allows normal vacuum signals between the intake and crankcase and does not create excessive restriction. Too much restriction can change crankcase pressure, which may increase oil consumption or otherwise affect engine seals.
Choose a design that maintains free flow while separating oil, and review any recommended plumbing diagrams for the Civic Si to preserve factory vacuum routing. For modified engines, consult how the catch can integrates with added components or altered boost levels, as that can change pressure conditions in the crankcase.
Why a Catch Can Helps the Civic Si Engine
The Civic Si engine uses a direct path for crankcase ventilation that can carry oil-laden vapors into the intake tract. Over time these vapors condense and contribute to carbon and residue buildup on intake runners, throttle bodies, and valves. By trapping much of the oil before it reaches the intake, a catch can reduces deposit formation and helps preserve throttle response and idle quality.
Owners who keep their cars for many miles or drive aggressively will see the greatest relative benefit because higher crankcase pressures and oil temperatures increase vaporized oil carryover. A well-chosen catch can addresses that specific failure mode without altering factory PCV function when installed correctly.
- Reduces oil residue in intake and throttle body
- Helps maintain consistent idle and throttle response
- Particularly useful with spirited driving or extended oil change intervals
Installation Considerations for the Civic Si
Plan the hose routing before beginning to avoid interference with heat sources and moving parts. The Civic Si engine bay has tight spaces around the valve cover and intake manifold, so choose a can and bracket that let you route hoses with gentle bends and secure them away from hot exhaust components.
Confirm included hardware matches the Civic Si mounting points. Some kits include universal brackets that require trimming or additional fasteners. If you prefer a cleaner installation, look for kits with specific instructions or mounting options that align with common Civic Si service points.
- Avoid sharp bends that could kink hoses
- Secure hoses with clamps and keep them away from heat
- Label or photograph stock hose locations to aid reassembly
Maintenance Tips to Keep the System Working
Establish a draining schedule based on driving style and the internal design of the catch can. Check the can after several hundred miles of spirited driving to gauge accumulation rate, then set a repeat interval. Use a clean container to capture drained oil and wipe connections when finished.
Inspect hoses and clamps during every oil change for signs of deterioration, swelling, or leaks. Replace any soft or discolored hoses and ensure clamps remain tight. Periodically open and inspect the internal baffle or filter to remove sludge that may reduce separation efficiency.
- Drain more often after spirited driving
- Inspect hoses and clamps at every service
- Clean or replace internal filters as recommended
How Catch Cans Interact with Turbocharging and Modifications
Although the Civic Si is naturally aspirated in standard configuration, owners who add forced induction or other engine modifications should consider how a catch can will handle altered crankcase pressures. Increased boost can push more oil vapor into the intake system, so a catch can with higher separation efficiency and secure hose connections becomes more important.
When modifying the engine, keep the catch can plumbing consistent with the intended crankcase ventilation path and consider remote drain options if placement becomes constrained by additional hardware.
- Higher crankcase pressure raises oil carryover
- Upgraded separation and reinforced hoses help with modified setups
- Plan drain access with additional engine components in mind
Common Installation Mistakes to Avoid
Do not create unnecessary length or excessive bends in the hoses. Kinks and tight turns restrict flow and can trap oil in the wrong place. Also avoid mounting the can where it will be constantly exposed to exhaust heat or road spray, which shortens component life.
Use proper hose clamps and match hose diameters to fittings. Leaving push-fit connections unsecured, or using undersized clamps, can lead to leaks or vacuum issues. Finally, do not omit a drain plan; an inaccessible can will likely be neglected, defeating its purpose.
- Avoid kinks and tight hose bends
- Do not mount near high heat sources
- Use correct clamps and hose sizes
Still looking for the perfect fit?
Select your Honda Civic configuration to see the most relevant Oil Catch Cans recommendations
How We Chose the Best Honda Civic Si Oil Catch Can
We focused on features that matter specifically for the Honda Civic Si engine layout and typical owner use. Our evaluation weighted build quality, fitment and mounting options that suit the Civic Si engine bay, and the clarity of included hardware and hose routing instructions. We prioritized units with serviceable internals such as removable baffles or disposable filters, and materials resistant to corrosion and heat exposure in the PCV path. Installation ease and the degree of vehicle-specific piping or universal adaptability were key, since tight access points on the Si can complicate DIY installs.We also considered oil separation efficiency, judged by can design and internal baffling rather than laboratory numbers, and the accessibility of drain or service ports for routine maintenance. Noise and vacuum effects were assessed to ensure the unit does not disrupt crankcase ventilation function. Units lacking clear fitment notes for the Civic Si, or with suspect sealing and hose connection quality, were excluded. The result is a selection of six catch can options that balance durability, serviceability, and straightforward installation for the Civic Si.
Our full evaluation process is outlined in our review methodology.
FAQ
How often should I empty a catch can on a Civic Si?
It depends on driving style and can design. Many owners check early after installation and then set an interval ranging from every oil change to every few thousand miles. Aggressive driving typically requires more frequent draining.
Will adding a catch can trigger a check-engine light?
A properly plumbed catch can that preserves the PCV flow and vacuum signals usually will not trigger engine management warnings. Issues arise when there are vacuum leaks or improper hose routing, so ensure all connections are sealed and routed as recommended.
Can I install a catch can myself on a Civic Si?
Many owners can install a catch can with basic hand tools and the included hardware. Tight engine-bay access can make routing hoses tricky, so plan carefully and follow any Civic Si-specific templates or instructions. If in doubt, seek professional help.
Does a catch can affect oil consumption?
A catch can itself does not reduce mechanical oil consumption, but by trapping oil vapors it can prevent oil entering the intake where it might be burned. If installed incorrectly and creating vacuum changes, it could potentially affect consumption, which is why correct plumbing matters.
Are there special hoses I should use for the Civic Si PCV connections?
Use hoses rated for oil exposure and engine heat. Silicone or fuel-resistant rubber hoses designed for PCV service are common choices. Avoid thin, low-quality vacuum tubing that can degrade or collapse under heat and vacuum.
Will a catch can harm my engine if I forget to empty it?
Neglecting to empty a catch can can reduce its effectiveness and, in extreme cases, allow accumulated oil to be drawn back into the intake. Regular checks and a sensible drain schedule prevent this risk.
Final Verdict
Prioritize a catch can that fits securely in the Civic Si engine bay, provides good separation and easy access for draining, and uses durable materials and fittings. Balance separation efficiency with low restriction to preserve normal PCV function. For most Civic Si owners, a can that is simple to service and mounts cleanly will deliver the clearest long-term benefits in reduced intake deposits and more consistent engine behavior.When choosing, weigh mounting convenience and maintenance frequency against internal design features. That approach will help you select a solution that protects the engine without adding unnecessary complexity.
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