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A failing exhaust manifold can cause noise, reduced engine efficiency, and potential emissions issues, so picking the right replacement matters. This guide helps you identify Scion xB exhaust manifold options that match the vehicle's fitment and intended use. We shortlisted top-performing choices based on build quality, fit, and long-term reliability. Below you will find clear criteria we used to evaluate each option and a concise roundup of the best manifolds for this model.
Looking for other parts? See all Scion xB parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Marketplace Auto Parts Exhaust Manifold with Gaskets and Hardware for 2004–2006 Scion xB |  |
| Best Quality Built to a higher standard if you want something more solid | PartCatalog Exhaust Manifold for Scion xB (2004–2006) |  |
| Best Value The sweet spot between price and what you get | A-Premium Exhaust Manifold Kit for Scion xA/xB and Toyota Echo (1.5L) |  |
| Best Budget The cheapest option that still gets the job done reliably | maXpeedingrods Exhaust Manifold with Gasket for Scion xA/xB and Toyota Echo 1.5L |  |
| Highest Rated A top-rated pick with lots of positive feedback | KAC Catalytic Converter with Exhaust Manifold for Scion xB / Toyota RAV4 (Front) |  |
| Best Seller A high-volume bestseller chosen again and again | Dorman 674-803 Exhaust Manifold Kit with Gaskets and Hardware |  |
1. Marketplace Auto Parts Exhaust Manifold with Gaskets and Hardware for 2004–2006 Scion xB
| Compatible Models | 2004-2006 Scion xB |
|---|---|
| Gasket Included | Yes |
| Mounting Hardware Included | Yes |
| Grade Type | Regular |
This exhaust manifold is a direct-fit replacement intended to restore the exhaust plumbing on 2004–2006 Scion xB models. It is precision-engineered to match the fit and function of the stock manifold and comes with the necessary gaskets and downpipe hardware so installation is straightforward for a professional or experienced DIYer. The unit is made from durable materials that resist warping and cracking, reducing the chance of leaks over time, and the included manifold and flange gaskets plus bolts and springs simplify a single-purchase repair. Because it is a regular-grade, factory-quality replacement rather than a performance part, it focuses on durability and correct fit instead of increased flow or weight savings. Buyers should expect the same emissions and drivability characteristics as the original manifold, and installation may require standard exhaust tools and torque procedures. This makes it a practical choice for restoring a leaking or damaged manifold without modifying vehicle performance.
Best for: Balanced all-round buyers who want a reliable, factory-quality replacement to restore fit and function on a 2004–2006 Scion xB without modifying performance.
Less Ideal for: Enthusiasts seeking a performance or high-flow aftermarket manifold or owners planning heavy engine upgrades should consider specialty performance parts instead.
- Direct-fit design matched to 2004–2006 Scion xB for straightforward replacement
- Includes necessary gaskets and mounting hardware for a single repair purchase
- Manufactured to resist warping and cracking to reduce future leaks
- Engineered to match factory fit and function for emissions and drivability continuity
- Not a performance-upgrade manifold so it will not increase exhaust flow or horsepower
- Described as regular-grade rather than premium materials which may not suit heavy-duty or high-heat modifications
Verdict: A complete, factory-quality replacement manifold sold with gaskets and hardware to restore exhaust fit and function on 2004–2006 Scion xB models.
2. PartCatalog Exhaust Manifold for Scion xB (2004–2006)
| Manufacturer | PartCatalog |
|---|---|
| Manufacturer Part Number | PC-591174 |
| Date First Available | September 25, 2023 |
This PartCatalog exhaust manifold is a direct-fit replacement designed for Scion xB model years 2004 through 2006. It replaces a damaged or worn factory manifold and installs like the original part, so typical installation requires standard exhaust hardware and gaskets with no major modifications. The listing emphasizes OE-spec manufacturing to deliver the same mounting points, flange alignment, and flow characteristics as the factory unit, which helps preserve engine performance and drivability. For a performance-oriented buyer this part provides reliable, predictable exhaust routing and maintains backpressure consistent with factory tuning. The practical benefits are straightforward: simplified fitment, time saved during installation, and compatibility with existing downstream components. Limitations are that this is a direct replacement rather than a performance-upgrade manifold, so it will not increase flow or offer weight savings compared with aftermarket performance headers, and any gains will be in restoration of original function rather than performance improvements.
Best for: Performance-oriented owners who prioritize restoring factory performance and reliability on a Scion xB 2004–2006 and want a precise, factory-spec replacement without tuning changes.
Less Ideal for: Buyers seeking increased power, reduced weight, or aftermarket tuning benefits should look at dedicated performance headers or tuned exhaust solutions instead.
- Direct-fit design for Scion xB 2004–2006 for straightforward installation
- Manufactured to OEM specifications to match factory mounting and flow characteristics
- Restores original exhaust routing and drivability after manifold failure
- Not a performance-oriented header so it does not increase exhaust flow or horsepower
Verdict: A factory-spec direct replacement that restores original exhaust function and fit on Scion xB 2004–2006.
3. A-Premium Exhaust Manifold Kit for Scion xA/xB and Toyota Echo (1.5L)
| Vehicle fitment | Scion xA/xB 2004-2006; Toyota Echo 2000-2005 1.5L |
|---|---|
| Material | Stainless Steel |
| Kit contents | Manifold, manifold gasket, flange gasket, 2 bolts, 2 springs |
| Manufacturer part number | APEMD099AM |
This exhaust manifold kit replaces the factory manifold on 1.5L Scion xB/xA and Toyota Echo engines to restore proper exhaust flow and sealing. It is supplied as a complete kit with a manifold, manifold gasket, flange gasket, bolts, and springs so you can swap the part without sourcing additional hardware. Made from stainless steel and billed as heat and corrosion resistant, the manifold is intended to resist warping under normal driving and prolong service life compared with a rusty original. Installation is typical for exhaust manifold work and may require basic tools, a torque wrench, and care with exhaust studs and gaskets to prevent leaks. The kit comes with a one-year unlimited-mileage guarantee from the maker. Expect a lower-cost alternative to dealer parts that suits budget-conscious repairs, but be prepared to verify fitment and follow correct torque sequence during installation since aftermarket manifolds sometimes need additional adjustments to match factory mating surfaces.
Best for: Practical optimizers who want a lower-cost, durable replacement that restores exhaust function without paying dealer prices and who are comfortable performing or overseeing a workshop installation.
Less Ideal for: Buyers seeking a direct factory-sourced part or guaranteed perfect fitment without any installation adjustment should consider dealer or OEM options instead.
- Complete kit includes manifold plus gaskets and mounting hardware for a one-stop replacement
- Stainless steel construction improves resistance to rust and heat compared with corroded cast parts
- Includes both manifold and flange gaskets to reduce the chance of exhaust leaks after installation
- Aftermarket fit can require minor finishing or careful alignment during installation to achieve a perfect seal
Verdict: A complete stainless steel manifold kit that restores exhaust sealing on 1.5L Scion xB/xA and Toyota Echo engines at a budget-friendly price.
4. maXpeedingrods Exhaust Manifold with Gasket for Scion xA/xB and Toyota Echo 1.5L
| Manufacturer | maXpeedingrods |
|---|---|
| Application | Scion xA/xB 1.5L 2004-2006; Toyota Echo 1.5L 2000-2005 |
| Material | Cast iron |
| Manufacturer Part Number | MV49GS |
This maXpeedingrods exhaust manifold is a direct replacement kit made from heavy duty cast iron intended for 1.5L Scion xA and xB models and the Toyota Echo. It replaces the factory manifold and includes the gasket for a straightforward swap during a repair or restoration. The cast iron construction resists heat and corrosion, so it should hold up under normal driving and restore proper exhaust routing when the original manifold is cracked or leaking. Fitment is listed specifically to those model years and engines, which simplifies selection for owners of those cars. Expect a basic, functional unit rather than performance gains; the part restores drivability and can improve fuel efficiency slightly if leaks were present. Installation requires standard tools and basic mechanical skill or a shop visit for tight engine-bay access. Finish and machining are utilitarian, so surface cosmetics and perfect fitment may require light adjustment in some cases. This is a value-focused replacement that prioritizes durability and compatibility over aftermarket performance tuning.
Best for: Budget-conscious owners who need a reliable, factory-style replacement manifold to fix exhaust leaks and restore normal engine operation without paying for a performance part.
Less Ideal for: Enthusiasts seeking increased exhaust flow, reduced weight, or tuned performance gains should consider a dedicated performance manifold instead.
- Cast iron construction offers strong heat and corrosion resistance for long service life.
- Includes gasket for one-stop replacement and simpler installation.
- Specifically listed for 1.5L Scion xA/xB and Toyota Echo fitment which reduces selection errors.
- Not designed to increase performance or flow compared with performance aftermarket manifolds.
- Finish and fitment are utilitarian and may need minor adjustment during installation.
Verdict: A durable, budget-focused cast iron replacement manifold that restores exhaust sealing and function for 1.5L Scion xB/xA and Toyota Echo owners.
5. KAC Catalytic Converter with Exhaust Manifold for Scion xB / Toyota RAV4 (Front)
| Position | Front |
|---|---|
| Oxygen Hole | 1 |
| Shell Material | Industrial Grade Stainless Steel |
| Substrate Material | Ceramic |
| Certification | EPA OBD-II Approved |
This KAC catalytic converter with integrated exhaust manifold is intended as a direct bolt-on replacement for the front converter on Scion xB 2008–2015 2.4L and RAV4 2006–2008 2.4L (use Scion xB fitment for this article). It pairs a ceramic substrate and high-performance catalysts made from rare earth and precious metals with an industrial-grade stainless steel shell and laser-welded joints for corrosion and heat resistance. The unit is EPA OBD-II approved, ships with gaskets and mounting hardware, and is designed for a bolt-down installation with one oxygen sensor port. In practice this means it should restore emissions performance, clear P0420-type codes when the original converter has failed, and maintain factory emissions compliance on federal models. Users report generally good fit when matching year and submodel, though some installers noted differences in heat-shield bolts and occasional minor alignment adjustments at the flange. Installation can require cutting or grinding of old fasteners on older cars, so expect a multi-hour job if rusted hardware is present. This is a practical, reliability-focused replacement that aims to match factory function while improving conversion efficiency compared with basic aftermarket cores.
Best for: A reliability-focused buyer who prioritizes restoring factory emissions performance and long-term durability on a Scion xB 2008–2015 2.4L, and who prefers a direct-fit, factory-replacement approach over custom solutions.
Less Ideal for: Buyers in states with their own emissions rules or those seeking a performance-tuned aftermarket exhaust component should look elsewhere.
- EPA OBD-II approved for federal emissions compliance
- Integrated exhaust manifold and bolt-on design simplifies replacement
- Industrial-grade stainless steel shell with laser-welded joints for corrosion and heat resistance
- High-flow ceramic substrate with rare earth and precious-metal catalysts for improved conversion efficiency
- Ships with gaskets and installation hardware for a complete replacement
- Not legal for sale or use in California, New York, and Maine
- Some users report mismatched heat-shield bolts or small alignment gaps that require minor adjustments
- Installation can be time consuming on older cars due to corroded exhaust fasteners
Verdict: A reliable, EPA-approved direct-fit front catalytic converter with integrated manifold that restores emissions function on compatible Scion xB models while emphasizing durability.
6. Dorman 674-803 Exhaust Manifold Kit with Gaskets and Hardware
| Manufacturer | Dorman Products |
|---|---|
| Model | Dorman 674-803 |
| Position | Center |
| Exterior | Ready To Paint If Needed |
| OEM Part Number | 101555; 1714121060 |
This Dorman exhaust manifold kit is a direct-replacement unit engineered to match the fit and function of the factory manifold for specified Scion and Toyota vehicles. It ships with all required gaskets and downpipe hardware so the typical installation replaces the manifold and seals in one visit without multiple parts orders. The part is described as reverse-engineered from the factory unit and built to resist common failure modes like warping and leaks, which helps restore exhaust routing and prevents exhaust leaks that can affect performance and emissions. The kit is ready-to-paint if desired and is positioned as a complete repair solution rather than a bare casting. Expect a straightforward bolt-on swap for the listed Scion xA, xB, and Toyota Echo years, but note that fitment must be confirmed for the Scion xD scope in the article and some installations may require basic mechanic tools and time for access in a compact engine bay. This is a practical choice when you want a full hardware-inclusive replacement without sourcing separate gaskets.
Best for: Risk-averse mainstream buyers seeking a reliable, hassle-minimizing repair solution who prioritize factory-quality replacement parts and want a single purchase that covers all required components.
Less Ideal for: Users who need a performance exhaust upgrade or a custom-fit solution beyond factory replacement should look for performance-specific manifolds or vehicle-specific aftermarket options.
- Includes all necessary gaskets and downpipe hardware for a one-order complete repair
- Built to match factory fit and function to simplify installation
- Durable construction aimed at resisting warping, cracking, and leaking
- Fitment is vehicle-specific so you must confirm compatibility before installing
Verdict: A complete, hardware-inclusive factory-replacement manifold kit designed to restore reliable exhaust sealing and fitment with minimal hassle.
Choosing the Right Scion xB Exhaust Manifold: Key Factors to Consider
Fitment and Bolt Pattern
Accurate flange alignment and bolt pattern matching are essential for a leak-free installation. If the manifold does not line up precisely with the cylinder head and exhaust system, you may face exhaust leaks, stress on mounting studs, or difficulty tightening hardware.
Fitment affects how straightforward the replacement will be and whether additional modifications or adapters are required. Prioritize manifolds specified for the Scion xB to minimize installation headaches and the risk of long-term sealing problems.
Material and Heat Resistance
Manifolds are commonly made from cast iron, stainless steel, or tubular steel, and each material behaves differently under heat cycles. Materials with higher thermal resistance are less likely to crack or warp over time, which preserves sealing and alignment.
Consider coatings and heat treatments that reduce corrosion and manage heat soak into nearby components. For vehicles driven in high-heat or corrosive environments, choose materials and finishes that extend service life and require less maintenance.
Gasket Surface and Sealing Design
The quality of the gasket surface and how the manifold interfaces with the cylinder head determine the likelihood of leaks. Smooth, flat mating surfaces and well-machined flanges help gaskets seat properly and maintain a seal through thermal expansion.
Design features such as raised or recessed flanges, integrated sealing surfaces, and compatibility with OEM-style gaskets should factor into your decision. A design that simplifies proper torqueing of fasteners will reduce the chance of uneven compression and subsequent leaks.
Thermal Management and Heat Shielding
Exhaust manifolds transfer a lot of heat to the engine bay, which can affect nearby sensors, wiring, and intake components. Effective thermal management reduces the risk of heat-related failures and can improve under-hood temperatures.
Look for manifolds that manage heat via material choice, integrated heat shields, or surface coatings. Consider how the manifold's heat output interacts with insulation and existing engine bay components to avoid heat soak and premature wear.
Durability and Resistance to Cracks
Repeated heating and cooling cycles place stress on manifold materials and can lead to cracking over time. Designs and materials that resist thermal fatigue help maintain performance and reduce the need for frequent replacements.
Evaluate manufacturing quality, such as consistent wall thickness, reinforced mounting points, and proven welding or casting methods. These factors influence how well the manifold resists cracks and stays serviceable across many miles.
Installation Complexity and Hardware
Some manifolds are engineered for straightforward bolt-on installation, while others require additional hardware, studs, or modifications. Ease of installation affects labor time and the potential for installation errors that could cause leaks.
Check whether the manifold comes with necessary gaskets, studs, or instructions and whether it requires special tools. Choosing a manifold with clear installation guidance and hardware that matches the Scion xB's specifications reduces DIY complications and shop labor.
How We Chose the Best Scion xB Exhaust Manifold
We prioritized components that ensure correct fit and longevity on the Scion xB. Key evaluation criteria included flange alignment and bolt pattern accuracy to guarantee straightforward installation, material and coating quality to resist warping and corrosion, and port matching to preserve exhaust flow characteristics. We also considered manufacturing tolerances that affect sealing, the design of mounting surfaces relevant to gasket performance, and overall construction that influences heat management.We excluded parts with unclear fitment data, nonstandard bolt patterns, or insufficient manufacturing information. Units intended only for racing or heavy modification were filtered out unless they also offered reliable street fitment. The resulting list focuses on manifolds that deliver dependable sealing, service life, and compatibility with the Scion xB's exhaust layout.
Our full evaluation process is outlined in our review methodology.
FAQ
What are common exhaust manifold symptoms I should watch for?
Common signs include a ticking or tapping noise that changes with engine speed, reduced engine responsiveness, and a noticeable change in exhaust tone. You may also detect exhaust odor in the engine bay or reduced fuel efficiency. These symptoms often indicate a sealing problem or crack in the manifold.
How can I diagnose an exhaust manifold leak on a Scion xB?
Diagnosis usually starts with a visual inspection for soot, cracks, or damaged gaskets at the flange areas. Listening for a high-pitched leak noise while the engine is running and using a smoke test or a handheld stethoscope can help pinpoint leaks. In some cases, observing changes in performance or emissions readings can also indicate a problem.
When should I replace the exhaust manifold gasket versus the entire manifold?
If the mating surfaces are flat and undamaged and the leak is confined to the gasket area, replacing the gasket can resolve the issue. If there is visible cracking, significant warping, or recurring leaks after gasket replacement, replacing the entire manifold is usually the more reliable long-term solution.
Are OEM manifolds better than aftermarket options?
OEM and aftermarket manifolds each have tradeoffs. OEM units are designed to match original fitment and materials, which can simplify installation. Aftermarket options may offer different materials or improved flow but can vary in fit and finish. The best choice depends on desired durability, fit requirements, and any performance goals.
Will swapping the exhaust manifold affect engine performance?
Swapping to a manifold with different flow characteristics can influence backpressure and scavenging, which may have minor effects on low-end torque or throttle response. For general replacement, matching the original flow profile and fitment usually preserves stock performance while restoring proper sealing.
What should I budget for installation and associated costs?
Installation complexity varies with the vehicle and shop labor rates. Expect longer labor if access is tight or if studs and hardware need replacement. Costs also depend on whether additional parts like gaskets or heat shields are required. Getting a written estimate that lists labor hours and parts will clarify expected expenses.
Conclusion
When choosing a replacement exhaust manifold for a Scion xB, focus first on correct fitment and flange alignment to prevent leaks. Balance material durability and thermal behavior with how the part will be installed and maintained.Consider gasket surface quality, resistance to cracking, and whether the unit includes appropriate hardware. Prioritizing these factors will help you restore exhaust flow and reduce noise while avoiding repeated repairs.
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