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If your Scion tC is showing reduced throttle response, rough idle, or louder-than-normal exhaust notes, the exhaust manifold could be the cause. Picking the right exhaust manifold matters because it directly affects exhaust flow, engine efficiency, and long-term reliability. This guide covers six shortlisted exhaust manifolds chosen for their fitment and durability, and explains the key criteria we used to evaluate them, including material quality and sealing performance. Read on to understand which attributes matter and what to check when choosing a replacement for your Scion tC.
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 | A-Premium Exhaust Manifold Kit for Scion xD / Toyota Corolla Matrix 1.8L |  |
| Best Quality Built to a higher standard if you want something more solid | ECHO AUTOMILES Catalytic Converter Exhaust Manifold for Toyota RAV4 / Scion tC 2.5L |  |
| Best Budget The cheapest option that still gets the job done reliably | Roneeson Engine Exhaust Manifold Gasket and Spring Assembly |  |
| Most Sold A high-volume bestseller chosen again and again | Dorman 674-803 Exhaust Manifold Kit with Gaskets and Hardware |  |
| Best Value for Money The sweet spot between price and what you get | A-Premium Exhaust Manifold Kit with Gaskets and Hardware |  |
| Best Overall The best all-around choice for most situations | Dorman Exhaust Manifold Kit with Gaskets and Hardware |  |
1. A-Premium Exhaust Manifold Kit for Scion xD / Toyota Corolla Matrix 1.8L
| Vehicle fitment | Scion xD 2008-2012; Toyota Corolla/Matrix 2009-2010 L4 1.8L |
|---|---|
| Material | Stainless Steel |
| Included parts | Manifold, gasket, flange gasket, bolts, springs |
| Grade type | Standard Replacement |
This exhaust manifold kit replaces the factory manifold on compatible 1.8L four-cylinder Toyota/Scion engines and ships as a complete installation kit with the main manifold, gasket set, flange gasket, bolts, and springs. It is made from stainless steel and marketed as a direct replacement to restore exhaust routing and seal the connection to the downpipe. Typical use is for repair or replacement after a crack, leak, or corroded original manifold; the included gaskets and hardware simplify reinstall and reduce the need to source parts separately. Reviews and the kit contents indicate generally good fitment and a solid finished surface, though a few customers noted minor bracket modification or imperfect flange gasket mating in some cases. The kit does not include a heat shield and one reviewer mentioned missing exhaust bolts for the downstream connection, so expect to verify all mounting hardware before installation. For reliability-focused repairs this kit provides an affordable, mostly complete replacement but may require a small workaround during fitting.
Best for: A reliability-focused buyer who wants a mostly complete, cost-effective factory-replacement manifold kit to restore normal exhaust sealing and operation with minimal sourcing hassle.
Less Ideal for: Buyers seeking a performance header or a plug-and-play upgrade with heat shielding should look for dedicated performance parts or kits that include all downstream fasteners and shields.
- Complete repair kit with manifold plus gaskets and springs to reduce parts hunting
- Stainless steel construction resists corrosion and handles high exhaust temperatures
- Designed as a direct replacement to match factory fit and simplify installation
- Positive user feedback shows consistent fit for 2009–2010 Corolla/Scion 1.8L installations
- Does not include a heat shield which some installations may require
- Some buyers reported the flange gasket or a mounting bracket needed minor adjustment
- A few users replaced downstream exhaust bolts that were not included or prone to rust
Verdict A practical, reliability-oriented stainless steel replacement manifold kit that restores exhaust sealing for compatible 1.8L Toyota/Scion engines but may need minor hardware or gasket tweaks during installation.
2. ECHO AUTOMILES Catalytic Converter Exhaust Manifold for Toyota RAV4 / Scion tC 2.5L
| Vehicle fitment | Scion tC 2011-2016 2.5L L4 |
|---|---|
| Reference part numbers | 16636, 641409 |
| EPA status | EPA compliant (federal) |
| Manufacturer | ECHO AUTOMILES |
This ECHO AUTOMILES unit combines a catalytic converter and exhaust manifold intended as a direct replacement for the Scion tC 2011–2016 2.5L four-cylinder. It is commonly used to restore proper emissions control and exhaust flow after a failed factory converter or damaged manifold. The design emphasizes higher flow to reduce backpressure, which can help the engine breathe better and support modest gains in drivability and efficiency when installed correctly. The part ships with the necessary gasket and is marketed as EPA compliant for federal use, making it suitable where emissions certification is required. Several owners report minor fitment adjustments during installation, such as rotating or reworking the flange or swapping fasteners, so a professional install or basic fabrication skills are advisable. The polished exterior is durable and the unit appears built to match OEM reference numbers, but it is not legal for sale or installation in California and Colorado and may be restricted in other states, so check local rules before fitting on a Scion tC.
Best for: Performance-oriented owners focused on restoring emissions control while improving exhaust flow on a Scion tC 2011–2016 2.5L who prioritize drivetrain responsiveness and factory-level emissions compliance.
Less Ideal for: Buyers in states with strict emissions rules who need a CARB-compliant unit or owners who expect a bolt-on, no-modification installation without any fabrication help.
- High-flow design reduces exhaust backpressure to support smoother engine performance
- Built to match OEM reference numbers for straightforward replacement of the original unit
- EPA-compliant construction for federal emissions standards
- Polished exterior finish resists corrosion and presents a factory-quality appearance
- May require minor welding, flange reorientation, or fastener changes for proper fitment on some vehicles
- Not legal for sale or installation in California and Colorado and may be restricted in other states
Verdict A performance-minded, EPA-compliant replacement that improves exhaust flow for Scion tC 2.5L but may need light fitment work and is restricted in several states.
3. Roneeson Engine Exhaust Manifold Gasket and Spring Assembly
| Fitment | Sentra 1.8L 2013-2017; Sentra 2.0L 2007-2012; Versa 2007-2012; NV200 2.0L 2013-2021 |
|---|---|
| Brand | Roneeson |
| Model | 14002-ET00A |
| Manufacturer Part Number | 14002-ET00A |
This gasket and spring assembly is a budget-focused replacement designed to reseal the exhaust manifold connection and stop leaks that cause noise and exhaust odor. It installs between the manifold and downstream exhaust components and includes the springs commonly used to maintain pressure and alignment under heat cycling. In practice it is a simple repair part for a leaking manifold flange or failing gasket surface and is typically used during exhaust repairs or when swapping a used manifold. The kit’s appeal is its straightforward fit intent and lower price compared with dealer parts, and users report it aligns with the factory pattern well enough for a reliable seal when installed carefully. Expect some fiddling during installation on compact engines and be prepared to transfer or reuse some factory hardware if needed. The catalytic-side gasket surface may require extra attention to achieve a perfect fit, so plan for a careful mock-up and hand-tightening sequence before final torque.
Best for: Budget-conscious DIYers and independent mechanics looking to repair a leaking exhaust connection without expensive dealer parts, prioritizing cost savings over premium fitment.
Less Ideal for: Drivers seeking a factory-direct OEM part or a precision-matched performance manifold gasket should consider higher-end or dealer-sourced alternatives.
- Low-cost replacement for sealing an exhaust manifold flange
- Includes spring assembly to maintain clamping force through thermal cycles
- Matches factory fit pattern for common Nissan 1.8–2.0L engines so installation is straightforward for experienced DIYers
- May require careful alignment and fiddling during installation on tight engine bays
- Catalytic-side gasket surface reported to be less than ideal in some cases
Verdict A cost-effective, factory-pattern replacement gasket assembly that fixes exhaust leaks affordably but may need careful installation to seal perfectly.
4. Dorman 674-803 Exhaust Manifold Kit with Gaskets and Hardware
| Brand | Dorman |
|---|---|
| Model | Dorman 674-803 |
| Position | Center |
This Dorman manifold kit is a complete replacement designed to restore the exhaust path and seal where the original manifold has failed. It is supplied with manifold and flange gaskets plus the spring bolts and downpipe hardware so a technician can replace a cracked or leaking manifold without sourcing extra parts. In practice the part installs like a factory-style replacement and is intended for mechanical repairs on compatible Scion and Toyota models. Users report generally good fit and weld quality, and the unit arrives ready to paint to match engine bay appearance. Be aware some reviewers reported isolated issues such as a broken weld or a slightly different pipe diameter on the exhaust donut, so thorough inspection before installation and careful mating surface prep are prudent. For a risk-averse buyer needing a one-box repair solution, this kit simplifies the job but check the part carefully on receipt.
Best for: Risk-averse mainstream buyers who prioritize a straightforward, reliable repair and prefer a complete, ready-to-install kit that reduces the chance of missing parts during the job.
Less Ideal for: Those seeking a performance-upgrade manifold or a custom-fit aftermarket header should look elsewhere; this is intended as a direct replacement for repair rather than performance enhancement.
- Complete kit includes manifold gasket, flange gasket, spring bolts and downpipe hardware for a single-order repair
- Designed to match factory fit and function for the listed vehicle applications
- Durable construction with welded joints and a coating that can be cleaned or painted for corrosion resistance
- Saves time by avoiding multiple parts orders when replacing a failing manifold
- Some units have reported manufacturing defects such as a broken weld or non-matching pipe diameter on the exhaust donut
- Fitment depends on selecting the correct application; buyer must confirm compatibility before ordering
Verdict A practical, one-box factory-style replacement manifold kit that simplifies exhaust repairs for compatible Scion/Toyota cars, but inspect for occasional quality issues before installation.
5. A-Premium Exhaust Manifold Kit with Gaskets and Hardware
| Compatible engines | 1.5L L4 (Scion/ Toyota listed compatibility) |
|---|---|
| Included components | Manifold, manifold gasket, flange gasket, 2 bolts, 2 springs |
| Material | Stainless Steel |
| Reference numbers | 674-803, 1714121060 |
This exhaust manifold kit provides a direct replacement manifold plus a flange gasket, manifold gasket, bolts and springs to re-establish exhaust flow and seal the head-to-pipe connection. It is typically used when a factory manifold has rusted, cracked, or developed leaks that cause noise or exhaust leaks. The part is made from stainless steel and is marketed to resist heat and corrosion; buyers report it generally lines up and installs with the included hardware, and the kit can return the engine to normal operation without buying dealer parts. Practical benefits include a complete hardware set that avoids hunting down separate bolts and the ability to replace a failing manifold in one job. Important limitations: gasket quality varies by sample and some installers reported fitment issues at the flange with the downstream pipe that required an additional gasket or adjustment, and finish oils applied for shipping may require cleaning before installation.
Best for: Practical optimizers who prioritize getting a complete, affordable replacement part that lets them fix a tired exhaust manifold without sourcing extra hardware or paying dealer prices.
Less Ideal for: Buyers seeking a factory-quality, long-term restoration who prefer OEM-brand parts or who want guaranteed precision fit to the downstream exhaust pipe should consider higher-end or dealer replacement options.
- Includes manifold gasket, flange gasket and mounting hardware so one purchase completes the job
- Stainless steel construction intended to resist heat, corrosion and warping
- Multiple customer reports of straightforward fit and installation on Echo/xA/xB engines
- Comes with springs and bolts which can save time replacing seized factory fasteners
- Gasket quality is inconsistent and may need replacement with higher-grade gaskets for long-term sealing
- Some users reported flange-to-pipe fitment problems that caused leaks without additional modification or a different donut gasket
- Finish coating/oil on the part can be hard to remove and may require solvents or running the engine to burn off
Verdict A complete, budget-friendly replacement manifold kit that can reliably restore exhaust function for practical owners but may need upgraded gaskets or minor fitment tweaks for a perfect seal.
6. Dorman Exhaust Manifold Kit with Gaskets and Hardware
| Installation Type | Bolt-On |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| Manufacturer | Dorman Products |
| Position | Center |
| Bolt Pattern (Number of Holes) | 7 |
This Dorman exhaust manifold kit replaces a worn or cracked passenger-side manifold and ships with the gaskets and mounting hardware needed for a single repair. Built from ductile iron, it is designed to resist the warping and cracking that affect lower-grade cast iron originals, and Dorman says the part is reverse-engineered from factory units for straightforward fitment. In practice the kit works as a one-stop repair: the included studs and nuts simplify reassembly and cut time locating parts, and multiple user reports note solid fit and elimination of exhaust leaks. Expect to swap the factory manifold during routine exhaust repairs on compatible Scion tC models and similar engines. A few buyers reported the supplied gasket and some fasteners are lower quality, so plan to have a higher-quality replacement gasket and new bolts on hand if you prefer OEM-grade consumables. Also, some minor trimming or fit adjustments were required in rare cases with temperature sensor clearance.
Best for: Balanced buyers who want a reliable, complete aftermarket replacement that simplifies a factory-style repair and avoids multiple orders and trips to the parts store.
Less Ideal for: Those seeking an exact factory consumables package out of the box or a premium gasket and bolt set should plan to buy higher-grade replacements separately.
- Complete kit includes manifold, manifold gasket, flange gaskets, studs and nuts for a single repair
- Ductile iron construction resists warping and cracking compared with lower-grade cast iron
- Reverse-engineered for direct, vehicle-specific fit to simplify installation
- Designed and tested in the United States with components to reduce additional parts orders
- Included gaskets and some fasteners are reported as lower quality compared with OEM replacements
- Occasional minor trimming or adjustment needed for clearance with sensors or brackets
Verdict A practical, vehicle-specific replacement manifold that bundles hardware for an easier repair, though you may want to upgrade the supplied gasket and bolts for OEM-level durability.
Choosing the Right Scion tC Exhaust Manifold: Key Factors to Consider
Fitment and Flange Geometry
Correct fitment is the baseline requirement because misaligned ports or flanges lead to exhaust leaks and installation headaches. Verify that the manifold matches the Scion tC's port spacing, bolt pattern, and oxygen sensor locations so it mates cleanly with the head and downstream exhaust.
Accurate flange geometry reduces stress on fasteners and gaskets, minimizing the chance of leaks from warping during heat cycles. A manifold that fits without forcing or modifying parts will typically require fewer new hardware items and offers a smoother install.
Material and Heat Resistance
Material choice affects durability under extreme thermal cycling. Cast iron is commonly used for its heat tolerance and resistance to cracking, while stainless steel can offer lighter weight and better corrosion resistance in certain climates.
Consider the environment where you drive and how long you plan to keep the vehicle. A material that resists corrosion and maintains structural integrity at high temperatures will reduce the chance of cracks and deformation over time.
Sealing and Gasket Compatibility
A reliable seal at the head-manifold interface prevents exhaust leaks that cause noise, poor fuel economy, and potential engine management issues. Look for manifolds designed to accept high-quality gaskets and that provide even flange contact pressure.
Gasket type and thickness can affect clearance to the downstream exhaust and catalytic converter. Choosing a manifold with straightforward gasket compatibility reduces the risk of residual leaks after installation.
Resistance to Cracking and Warping
Repeated heating and cooling cycles can warp or crack inferior manifolds, leading to recurring leaks and repair costs. Design features such as reinforced flanges, proper wall thickness, and thoughtful thermal expansion allowances help mitigate these risks.
Evaluate how the manifold handles thermal stress; options engineered to distribute heat evenly and resist deformation will usually require fewer repairs over the vehicle's life.
Installation Practicality
Ease of installation matters whether you install the manifold yourself or have a technician do the work. Manifolds that allow access to fasteners, do not require extensive removal of nearby components, and come with clear instructions reduce labor time and the chance of installation errors.
Consider whether additional parts or hardware are needed and whether the design necessitates special tools. Practical installation reduces overall inconvenience and helps ensure a proper seal from the start.
Long-Term Maintenance and Serviceability
Think about long-term ownership and how easy it will be to service the manifold or replace related components later. Features that simplify future gasket changes, oxygen sensor access, or removal without extensive disassembly improve serviceability.
A design that anticipates routine maintenance and allows straightforward access to wear items lowers lifetime hassle and can influence the total cost of ownership.
FAQ
What symptoms indicate a failing exhaust manifold on a Scion tC?
Common signs include a ticking or tapping noise during startup and acceleration, decreased engine performance, and stronger exhaust smell in the engine bay. You may also notice the check engine light if an oxygen sensor observes abnormal readings due to a leak.
Can I replace the exhaust manifold myself?
Many mechanically inclined owners can replace an exhaust manifold with basic tools, but access to fasteners and rusted bolts can complicate the job. It often depends on your comfort with engine work and whether the manifold requires removal of nearby components.
How do I diagnose an exhaust manifold leak?
A visual inspection for cracks or damaged flanges is a good start, along with listening for exhaust noise at idle and during acceleration. You can also feel for escaping exhaust gases around the flange with the engine running briefly, or monitor for diagnostic trouble codes tied to oxygen sensor readings.
Should I be concerned about a cracked exhaust manifold?
A crack can worsen with heat cycles and lead to louder noise, reduced efficiency, and potential engine sensor issues. It is usually advisable to address cracks promptly because they tend not to self-seal and can affect adjacent components over time.
Do exhaust manifold gaskets need to be replaced when swapping the manifold?
Yes, replacing gaskets during a manifold swap is recommended because old gaskets may be compressed or damaged and unlikely to provide a reliable seal. New gaskets help ensure proper flange sealing and reduce the chance of immediate leaks after installation.
How does installation complexity affect exhaust manifold selection?
Installation complexity can influence labor time and the need for additional parts or tools. Choosing a manifold with straightforward fitment and clear instructions can reduce installation errors and overall service time, making the repair more predictable.
How We Chose the Best Scion tC Exhaust Manifold
We prioritized parts that offer correct fitment for the Scion tC engine layout and exhaust routing, because proper alignment and flange geometry are essential to prevent leaks and ensure easy installation. Material and construction quality were evaluated next, with attention to cast iron and stainless-steel options that resist warping and cracking under repeated heat cycles. We also considered sealing performance, giving weight to manifolds designed to accept durable gaskets and provide consistent flange contact. Long-term durability and resistance to corrosion were assessed to favor options likely to last through thermal stress. Finally, ease of installation and the availability of clear fitment documentation were included to reduce installation time and unexpected modifications. We excluded any parts that required engine modifications, extensive fabrication, or did not explicitly fit the Scion tC. The result is a list focused on correct-fit, durable manifolds that address the common failure modes for this vehicle.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing an exhaust manifold for a Scion tC, prioritize correct fitment, durable materials, and reliable sealing to minimize leaks and recurring repairs. Weigh the tradeoffs between material choices and ease of installation against long-term serviceability. Focusing on the factors discussed will help you select a manifold that restores exhaust flow and reduces the likelihood of future failures. Address obvious symptoms promptly to avoid secondary issues and keep the engine running smoothly.
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