Mishimoto is excited to present the high-performance cat-back exhaust for the 2015+ Subaru WRX/STI. The stock exhaust often lacks an aggressive edge. Installing the Mishimoto stainless steel cat-back allows the exhaust to flow more freely, boosting horsepower, torque, and delivering a rich exhaust sound. After extensive testing of different muffler sizes and designs, our engineers picked oval mufflers. They cut down on highway drone while still giving an aggressive exhaust tone. Dyno tests on the 2015+ Subaru WRX/STI with CVT showed gains of up to 9 whp and 8 wtq using 93 octane fuel, all while keeping safe AFRs on a stock tune. This exhaust takes less than an hour to install and features quad 3.5in staggered double wall polished tips. It gives an extremely aggressive turbo and exhaust sound during acceleration and boost. Designed as a four-piece unit with precision TIG welded 304 stainless steel, it ensures a smooth exhaust flow from the 3.0in 2-bolt exhaust flange through the 2.25in y-section. It comes with two 2.25in V-Band clamps, a 3in exhaust band clamp, a new 3in 2-bolt flange gasket, and all stainless steel hardware, so you never have to worry about rust. For 2015 WRX owners aiming to maximize their car's performance, this cat-back exhaust pairs perfectly with the Mishimoto Performance Downpipe. Proudly made in the USA, it comes with the trusted Mishimoto Lifetime Warranty. This part fits various models including 2017 - 2020 Chevrolet Camaro LS, 2016 - 2020 Chevrolet Camaro LT and SS, and multiple 2015 - 2021 Subaru WRX and WRX STI models.

Using your Mishimoto cat-back exhaust is easy. First, make sure your car engine is cool. You can install the exhaust in less than an hour following the included instructions. During installation, ensure all the clamps are tightened properly. When driving, you'll notice a boost in performance and a great exhaust sound. As for maintenance, keep an eye on the exhaust system regularly. Check for any loose clamps or signs of damage. Since it's made of stainless steel, it's resistant to rust, but you can still clean it with a mild soap and water solution to keep it looking good. If you have any issues, remember it comes with the Mishimoto Lifetime Warranty, so don't hesitate to contact customer service.