Flashark 2008-2021 Subaru WRX Sedan and 2011-2021 Subaru WRX STI Sedan Cat-Back Exhaust System
Ready to Unleash the Boxer Roar? Give your WRX or STI the aggressive sound it deserves with our Cat-Back Exhaust System, designed specifically for 2008–2021 WRX and 2011–2021 WRX STI sedans. This system brings out the iconic rumble of the Subaru Boxer engine with a deep, free-flowing exhaust note that intensifies as you climb through the revs. At wide-open throttle, it delivers a raw, rally-inspired tone while maintaining a refined growl during normal driving with zero drone. Whether you're carving mountain roads or heading to work, this system transforms your daily drive into a performance experience.
Fitment:
- 2015-2021 Subaru WRX Sedan
- 2015-2021 Subaru WRX STI Sedan
- 2008-2014 Subaru WRX Sedan
- 2011-2014 Subaru WRX STI Sedan
Unleash the Signature Subaru Boxer Rumble with Performance and Style
✔ Dyno-Proven Gains: Instantly increase horsepower by 18HP and boost low-end torque for quicker acceleration and throttle response
✔ High-Flow Design: 3-inch mandrel-bent piping ensures smooth, unrestricted exhaust flow to maximize engine efficiency
✔ Deep, Aggressive Sound: Delivers a true rally-inspired tone under throttle, with a clean, low growl during daily cruising
✔ Durable TIG-Welded Construction: CNC-machined flanges and precision welds provide strength, pressure resistance, and long-lasting durability
✔ Direct Bolt-On Fitment: No modifications required—designed for a perfect fit on all 2008–2021 WRX and 2011–2021 STI sedans
✔ Available in Two Material Options: Choose between T-304 stainless steel for superior corrosion resistance, or 201 stainless steel for a more budget-friendly option without sacrificing performance
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Please Note: When cleaning exhaust tips, especially the blue tip variants, which are made using a heat treatment process that can be removed with aggressive cleaning agents, make sure to use water and, only if necessary, a very gentle soap. Never scrub or use any rubbing or cleaning compound on these tips as the color will be damaged and will not be warranted.
Specifications:
| Component |
Material |
Thickness (mm) |
Notes |
| Bend Pipes |
304 / 201 Stainless Steel |
1.23 – 1.25 |
Two material options available |
| Inner Perforated Tube (Muffler) |
409 Stainless Steel |
0.95 – 0.97 |
Located inside the muffler body |
| Perforated Tube End Cap |
304 Stainless Steel |
0.87 |
Cap the inner mesh tube |
| Flanges |
304 / 210 Stainless Steel |
10 |
Laser-cut for precise fit |
What's In The Box?
- 1*Silencer Tail Pipe
- 2* Main Pipe A
- 1*Gaskets, Clamps, and Hardware Kit
Exhaust System vs. Cat-Back Exhaust
The Exhaust System refers to the entire assembly that routes exhaust gases from the engine to the tailpipe. It includes components such as exhaust manifolds, catalytic converters, resonators, mufflers, and exhaust tips—playing a vital role in emissions control, noise reduction, and gas expulsion.
In contrast, a Cat-Back Exhaust system only covers the section from the back of the catalytic converter to the exhaust tip—excluding the catalytic converter itself. Upgrading to a Cat-Back system is a popular modification for those seeking improved exhaust flow, a deeper and more aggressive sound, and enhanced throttle response—all without altering the emissions-critical components near the engine. It’s a straightforward, emissions-compliant upgrade with noticeable gains and simple bolt-on installation.
