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.
Upgrading the exhaust on your Scion xD can change how the car breathes, responds, and sounds. Choosing the right cat-back exhaust system affects throttle response, backpressure, and cabin noise, so picking an option made for the Scion xD matters for reliable fit and performance. This guide covers our four shortlisted cat-back exhaust systems for the Scion xD and explains the evaluation criteria we used, including fitment accuracy and acoustic character. Read on to see which options best match specific driving goals and installation preferences.
Looking for other parts? See all Scion xD parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | MBRP XP Series 3" Cat-Back Dual Split Rear Race Exhaust System (S7275409) |  |
| Best Quality Built to a higher standard if you want something more solid | TurboXS Cat-Back Exhaust System FXT04-CBE for Subaru Forester |  |
| Most Sold A high-volume bestseller chosen again and again | MagnaFlow Street Series Cat-Back Exhaust System 16640 |  |
| Best Overall The best all-around choice for most situations | MBRP Installer Series S5261AL Cat-Back Exhaust System (Aluminized) |  |
1. MBRP XP Series 3" Cat-Back Dual Split Rear Race Exhaust System (S7275409)
| Series | XP Series |
|---|---|
| Inlet/outlet diameter | 3" tubing |
| Configuration | Dual split rear |
| Includes | Tips and hardware |
This MBRP XP Series cat-back replaces the factory rear section to free up exhaust flow and produce a deeper, more aggressive tone while remaining minimally intrusive at cruising speeds. Designed as a bolt-on system, it uses mandrel-bent 3-inch tubing and a dual split rear layout to reduce backpressure and is intended to install on the vehicle using existing hangers and supplied clamps. For a Scion xD this means a straightforward upgrade that can improve throttle response and give the car a stronger voice without extensive fabrication. Notable features include stamped logo tips, a race-oriented muffler tuning for a muscular sound, and construction meant to resist road exposure. Owners report easy installation for a home mechanic and noticeably improved exhaust note with limited highway drone. Be aware the system has had occasional fitment and alignment complaints on some installs, and materials are described as lighter gauge stainless compared with higher-end competitors which may affect long term corrosion resistance in harsh climates.
Best for: A reliability-focused buyer who wants a durable, bolt-on performance upgrade for their Scion xD that prioritizes straightforward installation and consistent real-world operation.
Less Ideal for: Buyers seeking the highest-end corrosion resistance or a perfectly engineered custom fit without any final adjustments should consider premium alternatives or pro installation.
- Direct bolt-on design that uses factory hangers and includes required clamps for a simple install
- Mandrel-bent 3" tubing and dual split rear layout aimed at improving exhaust flow and throttle response
- Tuned for a deep, aggressive sound with minimal highway drone reported by many users
- Packed as a complete system so you get tips and hardware in one box
- Some owners reported fitment and alignment issues requiring adjustments or minor modifications
- Construction uses a lighter gauge stainless compared with premium systems which could show wear faster in salty environments
Verdict A practical, bolt-on cat-back for Scion xD owners seeking a stronger sound and improved flow with easy installation, though fitment and long-term corrosion resistance may lag premium options.
2. TurboXS Cat-Back Exhaust System FXT04-CBE for Subaru Forester
| Fitment | 2004-2008 Subaru Forester 2.5 XT |
|---|---|
| Piping diameter | 3-inch |
| Muffler type | Straight-through |
| Manufacturer | TurboXS |
The TurboXS FXT04-CBE is a 3-inch cat-back exhaust built around a straight-through muffler to reduce backpressure and produce a deeper, more aggressive exhaust note. It installs in place of the factory rear exhaust and is typically used to free up midrange power and give the engine a fuller sound under acceleration. Notable features include the 3-inch piping and a straight-through muffler that promote exhaust flow and a lively high-RPM character while keeping highway cruising relatively subdued. Real-world benefits are improved throttle response and a stronger tone without excessive cabin drone on most setups. Installation is usually straightforward for someone familiar with underbody work, though users often pair it with an adapter or changed downpipe gasket and may need longer hangers to clear the bumper. Important limitations are that this system is made for specific Forester XT fitment and can be considerably louder if combined with an aftermarket or catless downpipe, so expect more volume in modified builds.
Best for: Performance-oriented buyers who prioritize improved flow and a stronger, sportier exhaust note and are comfortable making small fitment tweaks during installation.
Less Ideal for: Buyers who need a quiet, stock-like exhaust or who plan heavy emissions-related modifications should consider alternatives built specifically for stealth or compliance.
- 3-inch piping and straight-through muffler design for improved exhaust flow
- Delivers a deep, aggressive exhaust tone that remains relatively quiet at cruise
- Fitment designed to mount directly to the vehicle's back exhaust for an easier install
- Solid welds and a restrained tip profile that avoid an oversized aftermarket look
- Intensely louder when paired with aftermarket or catless downpipes
- May require a downpipe adapter, new gasket, or longer hangers for optimal fitment
Verdict A quality 3-inch cat-back that sharpens throttle response and gives a satisfying growl for drivers focused on performance, but expect louder volume with additional modifications.
3. MagnaFlow Street Series Cat-Back Exhaust System 16640
| Material Type | Stainless Steel |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| Included Components | Hardware Kit |
| Manufacturer Part Number | 16640 |
This MagnaFlow Street Series cat-back replaces the factory rear exhaust on the Scion xD to improve exhaust flow, midrange power and produce a deeper, throatier tone under acceleration. It is a direct-fit vehicle-specific system that includes the necessary hardware for installation and uses stainless steel construction aimed at resisting corrosion. Typical use is bolt-on replacement of the stock rear section to reduce back pressure and improve scavenging for a small but noticeable gain in mid-to-high RPM performance and a fuller interior and exterior sound. Notable features are the dyno-driven tuning for performance, robotic CNC construction for consistent fit, and a limited lifetime construction warranty for long-term ownership confidence. Important limitations are that it accentuates noise under load so it can be louder than stock during spirited driving, and some drivers report extra noise or tonal change above 4,000 rpm; installation may require cleaning rust from the cut intermediate pipe for a tight fit. The system improves driving feel without extreme volume but is not a silent upgrade.
Best for: Buyers who prioritize reliable, factory-quality upgrades and want modest performance and sound gains without extreme volume or experimental parts.
Less Ideal for: Drivers seeking a near-silent replacement or an aggressively loud show exhaust should consider other options tailored for minimal noise or maximum volume.
- Stainless steel construction resists corrosion for long service life.
- Vehicle-specific direct-fit design includes hardware for DIY installation.
- Tuned to improve exhaust flow and mid/high RPM performance.
- Produces a deeper, refined exhaust note that stays reasonable at idle.
- Backed by a limited lifetime construction warranty for peace of mind.
- Can be noticeably louder under heavy acceleration and above 4,000 rpm.
- May require prepping or cleaning the mating pipe for a tight fit during installation.
Verdict A durable, direct-fit cat-back for the Scion xD that delivers modest power gains and a fuller, controlled exhaust note while keeping installation straightforward.
4. MBRP Installer Series S5261AL Cat-Back Exhaust System (Aluminized)
| Installation Type | Bolt-On |
|---|---|
| Finish Type | ALUMINIZED |
| Manufacturer | MBRP |
| OEM Part Number | S5261AL |
This MBRP Installer Series S5261AL cat-back replaces the factory back half of the exhaust with a pre-axle dual-outlet design built from aluminized steel. It installs with clamps and hangers for a bolt-on fit and is intended to improve exhaust flow, which can sharpen throttle response and slightly improve fuel economy. The system produces a pronounced, truck-style rumble that is loud at higher throttle and can exhibit some low-speed drone until it breaks in. Build quality is solid for the price thanks to sealed tubing to resist seam rust, though some users report minor fitment fiddling at the inlet and longer hardware than needed. Installation is doable by a competent DIYer with hand tools and a saw for midpipe trimming when necessary, but a muffler shop can finish it quickly if you prefer. If you want a robust, budget-friendly way to give your vehicle a deeper, more aggressive exhaust note and modest flow gains, this kit delivers, but expect some noise and occasional adjustment during install.
Best for: A balanced all-round buyer who wants a budget-conscious, factory-quality-feeling exhaust that adds a deep, truck-style tone and modest flow improvements without chasing top-tier performance.
Less Ideal for: Drivers seeking a near-silent or strictly refined factory-like exhaust or those who need a perfect bolt-on fit with no trimming should consider different, quieter or vehicle-specific options.
- Bolt-on design for straightforward installation with clamps and hangers
- Aluminized steel and sealed tubing reduce seam corrosion compared with cheaper kits
- Pre-axle dual outlet delivers a louder, deeper exhaust tone and improved flow
- Constructed to the same specifications as higher-end lines, offering good value
- Aggressive sound may cause cabin drone until the system breaks in
- May require midpipe trimming or minor alignment adjustments during install
- Hardware and inlet fitment can require extra tools or minor modification
Verdict A value-focused cat-back that reliably adds aggressive tone and improved flow for drivers willing to accept some drone and minor install trimming.
Choosing the Right Scion xD Cat-back Exhaust System: Key Factors to Consider
Fitment and Vehicle-Specific Design
Correct fitment is the foundation of any exhaust upgrade for the Scion xD. A system engineered for this model will match hanger locations, flange dimensions, and routing around suspension and underbody components. Poor fitment can lead to exhaust leaks, rattles, or contact with heat-sensitive parts, which undermines both performance and safety.
When a system fits without modification you save time and avoid fabricating adapters or cutting factory sections. Fitment also affects alignment of tip placement and ground clearance, which matter for daily driving and parking. Confirming a vehicle-specific design reduces the risk of aftermarket surprises and simplifies installation.
Material and Corrosion Resistance
Material choice determines how well an exhaust system stands up to road salt, moisture, and heat cycling. Stainless steel alloys resist rust better than standard mild steel and generally last longer in climates with winter weather or coastal air. Thicker wall tubing and quality corrosion-resistant fittings extend usable life and reduce the likelihood of leaks forming at seams.
Weld quality and the use of corrosion-resistant clamps or hardware also influence durability. Investing in better materials can cost more up front but often lowers lifetime maintenance and replacement frequency, which is especially important if you keep the vehicle for several years.
Piping Diameter and Flow Characteristics
Piping diameter affects exhaust flow and backpressure. For a normally aspirated Scion xD, modest increases in diameter over stock can reduce restriction without hurting low-end torque. Oversized tubing can reduce exhaust gas velocity and negatively affect low-rpm responsiveness. The proper diameter balances improved flow with preserved drivability.
Mandrel-bent pipes maintain a smooth internal profile through curves and reduce turbulence compared with crush bends. Smooth flow contributes to more consistent engine performance and can make power delivery feel more linear across the rev range.
Muffler Design and Acoustic Profile
The muffler is the primary determinant of how an upgraded exhaust will sound inside and outside the car. Different internal designs emphasize different frequencies and volumes, producing tones that range from subtle and refined to aggressive and loud. Choose a muffler whose acoustic character matches your tolerance for cabin noise and neighborhood courtesy considerations.
Also consider resonance and drone at cruising speeds. Some designs minimize in-cabin drone while still delivering a stronger exterior presence under acceleration. If you use the car for long trips or daily commuting, prioritize a balance between engaging sound and tolerable long-distance comfort.
Ease of Installation and Hardware
Installation complexity affects how quickly you can fit the system and whether you can do it at home or will need professional help. Systems that use original hangers, include all necessary clamps and gaskets, and offer clear instructions reduce friction during installation. Bolt-on systems save time and lower the chance of leaks caused by improper sealing.
If welding or cutting is necessary, installation time and cost increase, and the work may require specialized tools or skills. Consider whether you want a true bolt-on solution or are comfortable with more involved modification for potential gains in routing or performance.
Legal Compliance and Emissions Considerations
Exhaust changes can affect emissions equipment and legal compliance in some areas. Certain cat-back systems preserve catalytic converter positioning and do not alter emissions control devices, while others might be intended for off-road use only. Check local regulations and whether an exhaust alters required emissions components.
Choosing a system that maintains emissions hardware and provides clear documentation about its intended use reduces the risk of inspection failures and potential fines. This factor matters especially if you drive in regions with strict vehicle inspections or emissions testing.
FAQ
Will a cat-back exhaust system fit my Scion xD without modification?
Many cat-back systems designed for the Scion xD are engineered for direct fitment and will bolt up using factory hangers and flanges. However, some designs may require minor adjustments or different clamps. Check the manufacturer's fitment notes and installation instructions to confirm what hardware or additional parts are included.
How does changing to a cat-back affect sound and performance?
A cat-back system typically alters exhaust tone and can reduce backpressure, which may improve throttle response and exhaust flow. The size of the pipes and muffler design determine whether the change is subtle or pronounced. Expect audible changes on acceleration, while real-world power gains depend on engine tuning and the rest of the exhaust path.
Is stainless steel worth it for a Scion xD exhaust?
Stainless steel offers better corrosion resistance and generally longer service life compared with mild steel, which is helpful in wet or salty environments. If you plan to keep the vehicle long term or drive in conditions that promote rust, stainless components often provide better value through durability.
Can I install a cat-back myself or do I need a shop?
Many cat-back systems are designed for bolt-on installation and can be fitted with common hand tools in a home garage. If the system requires welding, cutting, or extensive disassembly, professional installation is recommended. Your comfort with underbody work and access to tools should guide the decision.
Will a cat-back exhaust affect emissions testing?
Cat-back systems replace the exhaust downstream of the catalytic converter, so they often do not alter emissions outputs directly. That said, some systems are marketed for off-road or track use and may not be legal in all jurisdictions. Verify local regulations and that the converter and emissions control hardware remain intact.
How We Chose the Best Scion xD Cat-back Exhaust System
We focused on parts specifically designed to fit the Scion xD and evaluated them across measurable, real-world dimensions. Key criteria included fitment accuracy to factory exhaust hangers and flanges, material quality and corrosion resistance, and the design of the piping and muffler that influence flow and sound. We also considered ease of installation, looking at whether hardware and instructions were included and how much modification or fabrication is typically required. Acoustic profile was assessed for both inside-cabin tone and exterior volume so the selections suit a range of driver tastes. Finally, we checked durability indicators like weld quality and material thickness to favor long-term value. Products that required extensive vehicle modification, that lacked clear fitment information for the Scion xD, or that did not meet basic corrosion resistance expectations were excluded. The final list prioritizes systems that balance sound, flow, and installability for Scion xD owners.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a Scion xD cat-back exhaust system, prioritize correct fitment, corrosion-resistant materials, and a muffler design that matches how you drive. Balance modest piping increases to improve flow without compromising low-end response, and factor in installation complexity relative to your skills. Weigh acoustic goals against long-term durability and local emissions rules. Focusing on these tradeoffs will help you pick a system that enhances the driving experience while minimizing surprises during installation and ownership.
Explore More:
- Check out all Scion xD parts & accessories
- Explore Exhaust & Emissions
- Browse all Auto Parts
