STM WRX/STi 2015-2020 Cat-Back Exhaust

Looks great, sounds deep. The only thing anyone should be aware is that it does require a front pipe to mid pipe adapter IF you are still using the stock front pipe (some ppl call it j-pipe), because the stock front pipe has a donut gasket while this STM midpipe (and almost all the other aftermarket midpipe) has a flat gasket. You can somehow just tight them together without an adapter but leaks MIGHT happen in long-term, I personally bought one as a peace of mind. But still, it's a 5-star.

Great customer service, exhaust sound is deep and loud. But beware if your downpipe has a donut gasket (which is in my case, 2015 subaru wrx s4), it's better to buy a downpipe-catback adapter because this stm catback suits a flat gasket. Quality is flawless, I suggest you guys to badge the muffler tips so they'll look even cooler!

I recently installed the STM Tuned cat-back exhaust on my 2020 WRX, and I’m thoroughly impressed. The sound is truly exhilarating—when you get on it, the exhaust roars to life with a deep, aggressive note that perfectly complements the WRX’s sporty character. It definitely turns heads!

What I love most is the balance it strikes; at lower RPMs and cruising speeds, it remains pleasantly quiet, making daily driving a breeze. There’s no drone, so it’s comfortable on long trips. Overall, this exhaust has transformed my WRX’s personality, delivering a thrilling sound experience without sacrificing drivability. Highly recommend it for anyone looking to enhance their ride!