Part: # MMEXH-WRX-15. The stock cat-back exhaust systems often lack that aggressive edge. Install the Mishimoto Performance Stainless Steel Cat-back, and your exhaust system will breathe easier, delivering more horsepower, torque, and a deep, rich exhaust tone. Mishimoto's engineers tested various muffler sizes and designs and picked oval mufflers. These prevent highway drone while still giving an aggressive exhaust sound. On a 2015 WRX with CVT during dyno pulls, using 93 octane fuel and a stock tune, it showed gains of up to 9 whp and 8 wtq while keeping safe AFRs (check dyno chart in additional images). This exhaust installs in less than an hour and has quad 3.5” staggered double wall polished tips. Under acceleration and boost, it provides an extremely aggressive turbo and exhaust tone. Mishimoto designed it as a four - piece with precision TIG - welded 304 Stainless Steel, ensuring smooth exhaust flow from the 3.0” 2 - bolt exhaust flange through the 2.25” y - section. It comes with two 2.25” V - Band clamps, a 3” exhaust band clamp, a new 3” 2 - bolt flange gasket, and all stainless steel hardware, so no more rust worries. For 2015 WRX owners aiming to get the best from their cars, this cat - back exhaust pairs perfectly with the Mishimoto Performance Downpipe. It's proudly made in the USA and backed by the trusted Mishimoto Lifetime Warranty. Features: Direct fit for 2015+ Subaru WRX & STI; Aggressive turbo and exhaust tone under acceleration; Oval mufflers to prevent highway drone; Quick installation under an hour; Quad 3.5” staggered double wall polished tips; Full 304 stainless steel mandrel - bent construction; Dyno - proven power gains; TIG - welded for perfection; 3” to 2.25” exhaust split for proper velocity; Compatible with Mishimoto, stock, or most aftermarket downpipes; Made in the USA; Mishimoto Lifetime warranty. Note: If you're using a stock j pipe or downpipe, the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046 is required.
Using this Mishimoto cat - back exhaust is easy. First, make sure your car is a 2015 or newer Subaru WRX or STI. Installation should take less than an hour. You'll find all the necessary hardware in the package, like the V - Band clamps and the flange gasket. Just follow the included instructions to get it installed. When driving, enjoy the aggressive turbo and exhaust tone under acceleration and boost. It's also great on the highway as the oval mufflers prevent annoying drone. For maintenance, since it's made of 304 stainless steel, it's quite durable. But it's a good idea to clean it regularly with a mild stainless - steel cleaner to keep it looking good. If you're using a stock j pipe or downpipe, don't forget to get the GrimmSpeed adapter as it's required. And with the Mishimoto Lifetime Warranty, you can have peace of mind knowing you're covered.
