Mishimoto is proud to release the Performance Cat-back for the 2015+ Subaru WRX/STI. The biggest complaint is the stock cat-back exhaust systems lack of aggressiveness. By installing the Mishimoto Performance Stainless Steel Cat-back, the exhaust system is able to breathe easier, providing horsepower, torque, and a rich exhaust tone. After comparing many different muffler sizes and designs, the Engineers at Mishimoto chose oval mufflers which prevent highway drone, but still provide an aggressive exhaust tone. During dyno pulls with the 2015 WRX w/ CVT, Mishimoto saw gains of up to 9 whp and 8 wtq using 93 octane fuel while maintaining safe AFRs on a stock tune (see additional images for dyno chart). This exhaust installs in under one hour and features quad 3.5” staggered double wall polished tips. The Mishimoto Performance Cat-back Exhaust provides an extremely aggressive turbo and exhaust tone under acceleration and boost, giving you that aggressive tone you have been looking for! The engineers at Mishimoto designed this cat-back as a four-piece design with precision TIG welded 304 Stainless Steel. This allows a smooth exhaust flow from the 3.0” 2-bolt exhaust flange all the way through the 2.25” y-section. To top it off, this cat-back includes two 2.25” V-Band clamps, a 3” exhaust band clamp, a new 3” 2-bolt flange gasket, and all stainless steel hardware, so you don’t have to worry about your hardware rusting ever again! For 2015 WRX owners looking to get the most out of their WRX, this cat-back exhaust mates perfectly with the Mishimoto Performance Downpipe. The Mishimoto Cat-Back Exhaust is proudly made in the USA and comes with the Mishimoto Lifetime Warranty you know and trust. Subaru WRX/STI Cat-Back Exhaust, 2015+ 2015 Subaru WRX 2.0 Liter, 2015 Subaru WRX STI 2.5 Liter Fitment: 2015 Subaru WRX Base 2015 Subaru WRX Limited 2015 Subaru WRX Premium 2015 Subaru WRX STI Base 2015 Subaru WRX STI Launch Edition 2015 Subaru WRX STI Limited 2016 Chevrolet Camaro LT 2016 Chevrolet Camaro SS 2016 Subaru WRX Base 2016 Subaru WRX Limited 2016 Subaru WRX Premium 2016 Subaru WRX STI Base 2016 Subaru WRX STI Limited 2016 Subaru WRX STI Series.HyperBlue 2017 Chevrolet Camaro LS 2017 Chevrolet Camaro LT 2017 Chevrolet Camaro SS 2017 Subaru WRX Base 2017 Subaru WRX Limited 2017 Subaru WRX Premium 2017 Subaru WRX STI Base 2017 Subaru WRX STI Limited 2018 Chevrolet Camaro LS 2018 Chevrolet Camaro LT 2018 Chevrolet Camaro SS 2018 Subaru WRX Base 2018 Subaru WRX Limited 2018 Subaru WRX Premium 2018 Subaru WRX STI Base 2018 Subaru WRX STI Limited 2019 Chevrolet Camaro LS 2019 Chevrolet Camaro LT 2019 Chevrolet Camaro SS 2019 Subaru WRX Base 2019 Subaru WRX Limited 2019 Subaru WRX Premium 2019 Subaru WRX STI Base 2019 Subaru WRX STI Limited 2020 Chevrolet Camaro LS 2020 Chevrolet Camaro LT 2020 Chevrolet Camaro SS 2020 Subaru WRX Base 2020 Subaru WRX Limited 2020 Subaru WRX Premium 2020 Subaru WRX STI Base 2020 Subaru WRX STI Limited 2021 Subaru WRX Base 2021 Subaru WRX Limited 2021 Subaru WRX Premium 2021 Subaru WRX STI Base 2021 Subaru WRX STI Limited