Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
Choosing the right intake manifold for your Scion tC matters because it affects throttle response, idle quality, and long-term engine reliability. A manifold that fits precisely and uses durable materials reduces the chance of vacuum leaks and can make maintenance simpler. This guide covers the seven shortlisted Scion tC intake manifold options that met our editorial standards. We evaluated fitment, material and build quality, sealing methods, and serviceability to help you narrow the choices. Read on for practical guidance before the product listings.
Looking for other parts? See all Scion tC parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | GM Genuine Parts 12639087 Intake Manifold Assembly |  |
| Most Popular A crowd favorite that many people choose with confidence | FORRIE Improved Upper Intake Manifold for 1.4L Engines (Replacement) |  |
| Best Quality Built to a higher standard if you want something more solid | GM Genuine Parts 12638038 Intake Manifold Assembly |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Upper Intake Manifold Assembly for Toyota Echo / Scion xA xB (1.5L 1NZ-FE) |  |
| Most Sold A high-volume bestseller chosen again and again | Dorman 615-565 Engine Intake Manifold |  |
| Best Value for Money The sweet spot between price and what you get | NewYall 3.6L Upper Intake Manifold |  |
| Best Overall The best all-around choice for most situations | Dorman 615-380 Intake Manifold with Gaskets (Updated PCV Retainer) |  |
1. GM Genuine Parts 12639087 Intake Manifold Assembly
| OEM Part Number | 12639087 |
|---|---|
| Model | Intake Manifold Assembly |
| Exterior | Machined |
| UPC | 808709067702 |
This GM Genuine Parts intake manifold is a factory-quality replacement designed to restore correct air routing and mounting for compatible engines. In practice it is used to replace a damaged or worn intake manifold during repair or when swapping compatible components; buyers report it bolts in like a factory part and requires standard gasket and throttle-body matching. Notable features include GM validation for fit and form, machined exterior surfaces, and packaging intended to protect the casting in transit. The practical benefits are straightforward: correct fit, predictable sealing surfaces, and fewer fitment surprises compared with generic aftermarket castings. Limitations are that this is an OEM-specific component so it is only suitable where GM intake geometry and mounting match the vehicle, and users have reported occasional shipping damage to delicate ports like PCV nipples which may require inspection and replacement hoses during installation. Expect normal installation labor and possible small additional parts for swaps between different engine variants.
Best for: A reliability-focused buyer who prioritizes factory-quality replacement parts and wants a direct, predictable fit for GM-based repairs or compatible engine swaps.
Less Ideal for: Drivers seeking a universal aftermarket intake, custom performance intake, or a part for non-GM/Scion engines should look for alternatives tailored to their vehicle and goals.
- Factory-quality fit and finish validated by General Motors
- Machined exterior and manufacturing to GM specifications for reliable sealing
- Packaged to reduce transit damage compared with loose aftermarket parts
- Well suited for engine swaps where the GM intake bolt pattern and ports match
- PCV nipple and small ports can arrive damaged in some units requiring replacement hose or minor repairs
- Intended for GM engine applications only and not a universal fit
- No additional hardware or hoses included for swaps between different engine variants
Verdict Choose this GM Genuine Parts intake when you need a factory-quality, reliable replacement for compatible GM intake applications, but verify port condition on arrival.
2. FORRIE Improved Upper Intake Manifold for 1.4L Engines (Replacement)
| Manufacturer Part Number | FAP072 |
|---|---|
| OEM Part Number | 25200449, 55577314, 55581014, 615-380 |
| Item model number | Single Port |
| Item Weight | 3.08 pounds |
This FORRIE upper intake manifold is an aftermarket replacement intended to address a common PCV/non-return valve failure found on some 1.4L engines. It installs in place of the factory upper intake and is typically used when the original manifold is cracked, leaking, or causing excessive oil consumption. Notable changes claim to reduce the PCV valve failure by adding a redesigned plug/retention feature and a repaired non-return valve path. Buyers report it fits and solves crankcase overpressure and oil leakage issues when matched to the correct engine, though some installers needed to trim tabs or port plastic openings for a proper fit. Construction looks like standard aftermarket molding and it includes mounting holes that use self-tapping screws rather than factory threaded inserts, so care is needed when tightening the fuel rail fasteners. The part offers clear value compared with dealer alternatives, but fitment can be inconsistent and a careful test fit plus a quality gasket are recommended during installation.
Best for: Convenience-driven buyers who want a ready replacement to get a car back on the road quickly without sourcing dealer parts and who prioritize straightforward availability and cost savings.
Less Ideal for: Those seeking a guaranteed factory-identical rebuild or buyers unwilling to perform a careful test fit or minor adjustments should consider factory-quality replacements instead.
- Redesigned PCV/non-return valve area to reduce common failure and oil consumption issues.
- Direct replacement for affected 1.4L intake applications when vehicle-fit is correct.
- Good value compared with dealer or higher-cost aftermarket options.
- Many buyers report it resolves crankcase overpressure and related oil leaks.
- Fitment can require minor trimming or modification on some vehicles to seat correctly.
- Fuel rail mounting uses plastic holes with self-tapping screws rather than threaded metal inserts, increasing risk if over-tightened.
- A few users reported sealing or vacuum leak issues when the part was not precisely fitted or gasketed.
Verdict A budget-friendly replacement that often fixes PCV-related oil consumption problems but may need careful fitting and cautious fastening during installation.
3. GM Genuine Parts 12638038 Intake Manifold Assembly
| Manufacturer | ACDelco |
|---|---|
| Brand | GM GENUINE PARTS |
| Model | Manifold |
| Exterior | Machined |
This GM Genuine Parts intake manifold is a direct-fit factory-quality replacement designed to restore or maintain correct airflow for compatible engines. It installs where the stock manifold sat and routes intake air to the cylinders while matching factory flow characteristics. The product is machined and supplied by GM/ACDelco, which means fit, bolt pattern, and mounting points follow factory specifications so installation is straightforward for a trained technician. Practical benefits include durable construction and compatibility with factory sensors, which reduces the need for modifications to retain stock drivability. Buyers should note this is a factory-style manifold, not a high-flow aftermarket performance piece, so peak power gains will be limited compared with purpose-built performance manifolds; some small accessories such as the MAP sensor retainer clip and throttle body O-ring may be sold separately. For performance-focused Scion tC owners seeking a reliable, factory-grade replacement that preserves engine behavior and supports further bolt-on tuning, this manifold is a sensible base component.
Best for: Performance-minded buyers who prioritize factory-level reliability and a stable baseline for further tuning on a Scion tC, seeking a dependable replacement that preserves stock engine behavior.
Less Ideal for: If your main goal is maximum intake flow or significant power increases without additional modifications, choose a purpose-built performance manifold instead.
- Factory-quality design ensures correct fitment and mounting for compatible engines
- Machined exterior and OEM-level manufacture for consistent airflow and durability
- Backed by General Motors manufacturing standards and parts validation
- Reduces installation uncertainty compared with generic aftermarket manifolds
- Not engineered as a high-flow performance manifold so horsepower gains are limited
- Does not include some small installation items like the MAP sensor retainer clip or throttle body O-ring
Verdict A factory-grade replacement that prioritizes fit and durability for performance-focused owners who want a reliable foundation rather than an out-of-the-box power upgrade.
4. A-Premium Upper Intake Manifold Assembly for Toyota Echo / Scion xA xB (1.5L 1NZ-FE)
| Fitment Type | Direct Replacement |
|---|---|
| Material | Plastic |
| Gasket Included | Yes |
| Engine Compatibility | 1.5L 1NZ-FE |
This A-Premium upper intake manifold is a budget-focused direct replacement designed for Toyota Echo and Scion xA/xB vehicles with the 1NZ-FE 1.5L engine. It replaces the factory upper intake and includes gaskets so installers can swap the part without sourcing seals separately. The plastic construction and smooth inner walls are intended to restore proper airflow and engine breathing after a cracked or leaking OEM manifold, and reviewers report straightforward bolt-up fitment and functioning fastener locations. Practical benefits include a lower-cost option that arrives ready to install and can quickly solve idle, vacuum leak, or performance issues caused by a failing intake. Limitations are typical of lower-cost replacements: plastic molding may require minor cleanup inside the runner and some clip/fastener locations differ slightly from factory parts, which can add a few minutes to installation or require simple adjustments. For a budget repair that restores drivability, this manifold is a sensible choice; those seeking longer-term durability or factory-identical fasteners may prefer a different option.
Best for: Budget-conscious buyers who prioritize restoring drivability on a tight budget and prefer a ready-to-install replacement to fix vacuum leaks or cracked upper intake manifolds.
Less Ideal for: Shoppers who want exact factory-matching fasteners or are seeking the longest-term, heavy-duty durability should consider higher-end or OEM-quality alternatives.
- Direct-replacement fit for 1NZ-FE 1.5L applications with included gaskets
- Arrives ready to install which saves time sourcing seals
- Smooth inner runner design aimed at restoring airflow and engine response
- Lower-cost alternative to factory replacement that addresses common intake failures
- Plastic construction may have molding flash or require minor interior trimming before install
- Some wire loom fasteners and clips are different from factory locations which can need adjustment
Verdict A low-cost, ready-to-install upper intake manifold that restores airflow and fixes common vacuum issues on 1.5L 1NZ-FE Scion/Toyota models while sacrificing some factory-perfect fit and long-term robustness.
5. Dorman 615-565 Engine Intake Manifold
| Brand | Dorman |
|---|---|
| Automotive Fit Type | Universal Fit |
| Position | Center |
| OEM Part Number | 171010H010; 17120-28100; 17120-28141; 171200H010 |
This Dorman intake manifold is a direct replacement designed to restore the original fit and performance on compatible engines, including the Scion tC. It comes ready to install with intake and throttle body gaskets included, and is manufactured and tested to meet factory-quality fit and function. Typical use is a like-for-like repair to stop rattling or vacuum issues caused by a failed OEM manifold baffle or cracks. Buyers report straightforward installation when standard removal steps are followed, though access to lower bolts can be tight and may benefit from a long extension or a powered ratchet. The manifold is plastic but finished smoothly and accepts the original shields and connections, so wiring and hoses reattach without modification. Expect the part to quiet rattles and restore proper intake sealing, but plan for a moderately involved job that may require some disassembly and careful handling of old brittle hoses and connectors. This is a sensible choice for replacing a failing factory manifold on the Scion tC when you want a reliable, factory-quality replacement without performance upgrades.
Best for: Risk-averse mainstream buyers seeking a dependable, factory-quality replacement to fix rattling or leaking intake issues on a Scion tC and restore quiet, reliable operation.
Less Ideal for: People looking for performance upgrades or materials upgrades beyond a stock-equivalent replacement should consider aftermarket performance manifolds or metal alternatives.
- Factory-quality fit and function engineered to match the original manifold
- Includes intake and throttle body gaskets for a more complete installation
- Thoroughly tested construction aimed at reliability and durability
- Smooth finish and precise dimensions that accept original shields and connections
- Plastic construction rather than metal may concern buyers seeking heavy-duty materials
- Installation can be labor-intensive with limited access to lower bolts
Verdict A solid factory-quality replacement for Scion tC owners who want a reliable fix for a rattling or failing intake manifold without changing performance.
6. NewYall 3.6L Upper Intake Manifold
| Engine fitment | 3.6L V6 only |
|---|---|
| Manufacturer | NewYall |
| Model number | 5l84693AE |
This NewYall upper intake manifold is a straightforward replacement part for vehicles with the 3.6L V6 engine. It installs in place of the factory upper intake to restore proper air routing to the intake ports and is typically used when the original manifold is cracked, leaking, or otherwise failing. The listing specifies broad Chrysler and Dodge fitment for model years that used the 3.6L, and customers report good fit and function when the engine matches. Practical features include a direct-fit design aimed at matching factory mounting points and a construction that supports normal engine breathing without modifications. Expect routine installation tasks such as swapping sensors, gaskets, and fasteners. Limitations are that it is made for the 3.6L V6 only and will not fit other engines, and occasional fitment or bolt torque issues have been reported that may require attention during installation. For buyers looking to replace a failing upper manifold with an economical, factory-style unit this is a sensible option, but verify engine compatibility and torque each fastener carefully during installation.
Best for: Practical optimizers who prioritize restoring reliable, factory-like operation at a lower cost than dealer parts and who are comfortable verifying fit and handling a standard replacement install.
Less Ideal for: Drivers seeking a performance intake manifold or users with engines other than the 3.6L V6 should look for alternate parts tailored to their goals or engine type.
- Direct-fit replacement designed for the 3.6L V6 to match factory mounting points.
- Economical option compared with dealer parts for common intake manifold failures.
- Customer reports indicate good fit and usable performance when matched to the correct engine.
- Comes from a recognizable aftermarket brand with multiple product images to verify part appearance.
- Specified only for 3.6L V6 engines so it is not universal across other displacements.
- Some buyers reported difficulty achieving proper bolt torque during installation, which may require extra care or rework.
- Not a performance upgrade; intended as a factory-style replacement rather than improved flow or materials.
Verdict A cost-conscious, factory-style replacement for failing 3.6L upper intake manifolds that works well when engine compatibility and careful installation are confirmed.
7. Dorman 615-380 Intake Manifold with Gaskets (Updated PCV Retainer)
| Manufacturer | Dorman Products |
|---|---|
| Model | 615-380 |
| Automotive Fit Type | Vehicle Specific Fit |
| Exterior | Ready To Paint If Needed |
This Dorman intake manifold replaces the factory unit and is intended to solve a common failure where the internal PCV valve becomes dislodged, causing oil consumption and driveability faults. It is used as a direct replacement and ships with a throttle body gasket, port gaskets, fuel injector O-rings, MAP sensor O-ring and mounting screws to simplify installation. The manifold is molded from a nylon polymer designed to resist cracking and warping and Dorman added a retaining pin behind the PCV valve to prevent the valve from coming loose again. In practice this means fewer repeat failures and less chance of related valve cover damage or oil leaks after installation. Installation can be straightforward for a competent DIYer but may take several hours and some users pair the replacement with a valve cover or vent hose for a complete repair. Limitations include the all-plastic construction which can be brittle if handled roughly and reports that some kits omit bottom injector O-rings depending on service needs, so double-check kit contents before starting the job.
Best for: A balanced all-round buyer looking for a reliable, ready-to-install replacement that fixes a known PCV-related failure and minimizes future maintenance headaches.
Less Ideal for: Owners who prefer metal intake manifolds, want a performance-oriented aftermarket part, or who are unwilling to verify kit contents and spend time on a multi-hour installation.
- Redesigned retaining pin secures the internal PCV valve to prevent repeat failures.
- Complete installation kit includes multiple gaskets and O-rings to reduce parts sourcing.
- Nylon polymer construction resists cracking and warping compared with older units.
- Vehicle-specific fit reduces modification and simplifies installation when matched correctly.
- All major components are plastic which can be brittle during handling or removal.
- Some users report missing lower fuel injector O-rings in the kit for certain service procedures.
Verdict A practical, vehicle-specific replacement that addresses the intake manifold PCV failure and comes with most gaskets and seals for a straightforward repair.
Choosing the Right Scion tC Intake Manifold: Key Factors to Consider
Fitment and Port Alignment
Accurate fitment and port alignment are essential because mismatched ports or offset flanges will cause poor airflow and can stress mounting points. A manifold that matches OEM bolt patterns and port geometry reduces the risk of vacuum leaks and ensures sensors and hoses reach their mounts without strain.
When bolt holes and mating surfaces align precisely, installation is faster and less likely to require modification. Misalignment can lead to warped mating faces or uneven gasket compression, which causes persistent leakage and degraded engine performance.
Material and Thermal Stability
The material used for the manifold determines how it handles heat cycles and resists cracking or warping. Metal alloys and reinforced composites each have different thermal expansion rates, which affects gasket life and the likelihood of developing leaks over time.
Choosing a material with good heat resistance and dimensional stability reduces maintenance needs. Durable finishes and corrosion resistance also matter if the vehicle sees humid or salty environments, since deterioration can compromise sealing surfaces and fastener threads.
Sealing Design and Gasket Interface
A well-designed sealing surface and an appropriate gasket type are crucial to prevent intake manifold leaks that cause rough idle or poor fuel economy. Look for manifolds with flat, machined mating faces and clear guidance on the correct gasket style and orientation.
Gasket compression characteristics influence how torque spread affects the seal. Some designs use bead or O-ring style seals at critical interfaces to reduce the chances of vacuum leaks. A robust sealing design lowers the need for repeat repairs and helps maintain consistent engine vacuum readings.
Compatibility with Sensors and Vacuum Lines
Intake manifolds must accommodate the vehicle's MAP, IAT, and other engine sensors as well as vacuum fittings for brake boosters or EVAP systems. Ports that match factory locations avoid rerouting hoses or using adapters that can introduce leak points.
Correct sensor placement preserves accurate engine management readings, which is important for fuel trim and emissions-related behaviors. Manifolds that retain OEM sensor and vacuum line geometry reduce installation time and support reliable long-term operation.
Ease of Installation and Serviceability
Installation complexity affects the time and tools required and may determine whether you can do the job yourself. Manifolds that provide clear bolt access, labeled ports, and compatible fastener interfaces save time and lower the risk of installation errors.
Serviceability also includes access to gasket surfaces and the ability to retorque fasteners if needed. Designs that facilitate routine inspection and cleaning help you address issues like carbon buildup without removing unrelated components.
Durability and Long-Term Maintenance
Consider how the manifold will hold up over the expected lifespan of the vehicle and what maintenance it will require. Durable construction and quality finishes reduce the chance of stress cracks or corrosion that lead to leaks.
Also factor in the availability of replacement gaskets and common service parts. A manifold that is easy to maintain and uses standard consumables will typically cost less to own over time and offer more predictable reliability.
FAQ
How can I tell if my Scion tC intake manifold has a vacuum leak?
Signs of a vacuum leak often include a rough or fluctuating idle, increased idle speed, or a hissing sound near the engine. You may also notice reduced engine responsiveness or transient lean-running symptoms. A smoke test or carefully listening while the engine idles can help identify the leak location, and checking gasket surfaces and vacuum hose connections is a good starting point.
Do intake manifold gaskets need replacement when installing a new manifold?
Yes, replacing the intake manifold gasket is generally recommended whenever the manifold is removed. Gaskets compress and conform during installation, and reusing an old gasket can lead to incomplete sealing and vacuum leaks. New gaskets ensure proper sealing and reduce the risk of having to disassemble the assembly again shortly after installation.
How important are torque specs when installing an intake manifold?
Proper torque specifications are important because they ensure even gasket compression and prevent warped mating surfaces. Under-torquing can lead to leaks, while over-torquing can damage threads or the manifold flange. Follow the vehicle-specific torque sequence and values to achieve a reliable seal and avoid unnecessary repairs.
Can cleaning the intake manifold improve performance?
Cleaning the intake manifold can restore airflow and reduce idle instability if carbon buildup or oil deposits are restricting passages. It often improves throttle response and allows sensors to read more consistently. However, cleaning will not fix issues caused by cracked or warped manifolds or failed seals, so inspect surfaces thoroughly before reinstallation.
What causes intake manifold symptoms like rough idle or reduced power?
Those symptoms commonly result from vacuum leaks, deteriorated gaskets, clogged ports, or malfunctioning vacuum-operated components. Thermal distortion of the manifold can also affect sealing and airflow. Diagnosing the root cause usually involves visual inspection, vacuum and pressure tests, and checking related hoses and fittings.
Is a performance-oriented intake manifold worth it for everyday driving?
A performance-oriented manifold can alter airflow characteristics to improve throttle response or top-end power, but the benefits depend on the rest of the engine setup. For everyday driving, gains are often modest unless combined with supporting modifications. Consider serviceability and compatibility with existing engine systems before choosing a performance-focused option.
How We Chose the Best Scion tC Intake Manifold
We focused on parts specifically designed to fit the Scion tC and screened candidates for correct OEM or direct-fit dimensions, reliable sealing methods, and materials suited to under-hood temperatures. Key criteria included machining and casting accuracy, flange and port alignment, durability of materials and finishes, and compatibility with existing engine sensors and vacuum fittings. We also considered ease of installation, availability of replacement gaskets, and whether the design reduced common failure modes like warping or stress cracking. Products that required significant modification, universal-fit manifolds, or unclear fitment documentation were excluded. We prioritized options that balance solid construction with straightforward installation and clear torque and sealing specifications to minimize post-installation leaks and maintenance.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a Scion tC intake manifold, prioritize precise fitment, durable materials, and a sealing design that minimizes the risk of vacuum leaks. Those factors directly affect idle quality, throttle response, and long-term reliability. Balance ease of installation and serviceability with thermal stability and availability of replacement gaskets. Being mindful of these tradeoffs will help you pick an option that meets your performance and maintenance expectations without unexpected complications.
Explore More:
- Check out all Scion tC parts & accessories
- Explore Engine
- Browse all Auto Parts
