2008-2021 Subaru WRX Sedan 2.0L / 2.5L H4 Cat-Back Exhaust
This cat-back exhaust is built for 2008-2021 Subaru WRX 4-Door Sedan owners who want to replace the factory exhaust from the catalytic converter back without re-engineering the rest of the system. The system bolts directly to the OEM downpipe flange on both the 2.0L FA20 and the 2.5L EJ255 H4 Boxer engines, and it also fits the 2011-2021 WRX STI 4-Door Sedan. Installation stays at the factory mounting points, so the kit does not require an aftermarket downpipe, weld work, or an ECU re-flash.
The system is sold under one SKU (FLEXS22-00083SR-000-L) with two material variants. Pick SS201 stainless for budget builds or step up to SS304 stainless for marine-grade corrosion resistance in snow-belt or coastal climates.
Specifications
| Component | Material | Thickness |
|---|---|---|
| Bend Pipes | 304 / 201 Stainless Steel | 1.23 - 1.25 mm |
| Inner Perforated Tube | 409 Stainless Steel | 0.95 - 0.97 mm |
| Perforated Tube End Cap | 304 Stainless Steel | 0.87 mm |
| Flanges | 304 / 201 Stainless Steel | 10 mm |
| Pipe Diameter | 3" (76.2 mm) mandrel-bent | — |
| System Type | Cat-Back (single-exit) | — |
| Variant — SS201 | Budget-friendly 201 stainless | $299.99 |
| Variant — SS304 | Marine-grade 304 stainless | $349.99 |
Key Features
- System Coverage: Replaces the exhaust from the OEM catalytic converter outlet flange to the rear exit, while the catalytic converter, OEM downpipe, and O2 sensors stay in their stock positions.
- Mandrel-Bent 3" Tubing: True 3" (76.2 mm) piping with mandrel bends holds a consistent internal diameter through every curve, avoiding the flow restriction seen on crush-bent competitors.
- SS201 or SS304 Stainless Build: Two variants cover both budgets and climates: SS201 ($299.99) for standard builds, SS304 ($349.99) for marine-grade corrosion resistance in snow-belt or coastal use.
- Direct Bolt-On Mounting: Reuses the factory 3" downpipe flange and stock mounting points, so the install requires no cutting, no welding, and no aftermarket downpipe adapter.
- Integrated Resonator Tuning: The built-in resonator is tuned to keep cabin drone manageable at highway cruising speed while preserving the Boxer note on cold start and wide-open throttle.
- Hardware Kit Included: Gaskets, clamps, and mounting hardware ship in the box, so the install does not require a separate parts-store run.
What's Included
- 1 x Silencer Tail Pipe (pre-assembled resonator)
- 2 x Main Pipe A (front-to-mid and mid-to-rear sections)
- 1 x Gaskets / Clamps / Hardware Kit
- 1 x Installation Guide
Check Before Ordering
- Confirm your vehicle is a 2008-2021 Subaru WRX 4-Door Sedan (or 2011-2021 WRX STI 4-Door Sedan). Coupe, hatchback, and 2022+ WRX VB chassis vehicles require a different system.
- Confirm the engine is the 2.0L (FA20) or 2.5L (EJ255) H4 Boxer. Other Subaru trims (e.g., 2.4L FA24 in 2019+ Ascent / Outback) are not covered by this SKU.
- Confirm your existing exhaust uses the OEM-style 3" downpipe flange. Aftermarket test pipes with non-OEM flanges will require an adapter that is not included in this kit.
- Choose the right material variant before checkout: SS201 for budget builds, SS304 for snow-belt, coastal, or high-humidity climates.
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
Fitment & Compatibility
- Fits factory-equipped vehicles with listed configurations.
- ✅Please confirm vehicle specifications before ordering.
| YEAR | MAKE | MODEL | ENGINE | BODY |
|---|---|---|---|---|
| 2008-2021 | Subaru | WRX | 2.0L H4 | Sedan — 4 Door |
| 2.5L H4 | Sedan — 4 Door |
2008-2021 Subaru WRX Sedan Cat-Back Exhaust FAQs
Q1: Will this cat-back fit my 2015 Subaru WRX sedan?
A1: Yes. The system is engineered for the 2008-2021 Subaru WRX 4-Door Sedan, which covers every 2015 WRX sedan with either the 2.0L (FA20) or 2.5L (EJ255) H4 Boxer engine. It bolts to the OEM downpipe flange and reuses all factory mounting points.
Q2: Does it fit the WRX STI?
A2: It fits the 2011-2021 Subaru WRX STI 4-Door Sedan. It is not compatible with the 2008-2010 WRX STI Hatchback, and it does not fit the 2022+ WRX VB chassis or any coupe / hatchback variant.
Q3: Will this work with the OEM downpipe, or do I need an aftermarket downpipe?
A3: The system bolts directly to the OEM downpipe using the factory-style 3" flange. No aftermarket downpipe is required. If you already have an aftermarket cat-back downpipe with the same OEM-style flange pattern, it will also mate up without adapters.
Q4: Is installation something I can do at home, or do I need a shop?
A4: Most enthusiasts with basic hand tools (socket set, wrench set, penetrating oil, jack and jack stands) can complete the install at home. No welding, no cutting, and no ECU re-flash is required. If you are not comfortable working underneath the car, any exhaust or muffler shop can install it for a typical labor charge.
Q5: What size is the piping?
A5: The system uses true 3" (76.2 mm) mandrel-bent stainless steel piping throughout. Mandrel bending preserves the internal diameter at every bend, which keeps exhaust velocity high and avoids the flow restrictions seen on cheaper crush-bent systems.
Q6: Will this throw a check-engine light or require a tune?
A6: No. Because the system bolts to the OEM downpipe and does not modify the catalytic converter or any O2 sensor location, it does not trigger a check-engine light and does not require an ECU re-map. You can install it and drive away with no tuning required.
Q7: What is the difference between the SS201 and SS304 variants?
A7: The SS201 variant ($299.99) uses 201 stainless steel for the bend pipes and flanges, making it the most affordable option for budget builds. The SS304 variant ($349.99) upgrades to marine-grade 304 stainless for significantly better corrosion resistance in snow-belt regions that use road salt or in coastal areas with salt air. Both variants share the same 409 stainless inner perforated tube and identical acoustic tuning.
Q8: How loud is it inside the cabin at highway speed?
A8: The system is tuned with a balanced resonator geometry that keeps cabin drone to a minimum at 70-80 mph cruising while still delivering the Subaru Boxer rumble on cold start and under wide-open throttle. Most owners report the cabin note is noticeably more aggressive than stock but well within daily-driver comfort for long highway commutes.
Q9: Do you sell the gaskets and clamps separately, or are they included?
A9: The gaskets, clamps, and all required mounting hardware are included in the box at no additional cost. You will not need to source any extra parts to complete the install beyond basic hand tools and a can of penetrating oil for the factory bolts.
Q10: Will this change my fuel economy?
A10: Fuel economy changes are typically negligible because the catalytic converter and O2 sensors remain in their stock locations and the ECU sees the same exhaust back-pressure profile. Results vary with driving style and conditions, but most owners report no noticeable change in daily MPG.
Q11: Can I install this on a 2022 or newer WRX (VB chassis)?
A11: No. This system is engineered for the 2008-2021 WRX chassis only. The 2022+ WRX uses a completely different VB chassis layout, mounting point pattern, and exhaust routing. If you own a 2022+ WRX, please look at the VB-specific Flashark cat-back listings.
Q12: Is there a warranty, and what happens if a part is missing from the box?
A12: Flashark stands behind every cat-back exhaust with a manufacturer defect warranty. If you open the box and discover a missing gasket, clamp, or hardware piece, contact our support team with your order number and we will ship the replacement parts immediately at no cost.