The Injen Performance Cat-Back Exhaust System for the 2015-2021 Subaru WRX and WRX STI was designed from the ground up to compliment the aggressive styling and blistering performance of these sporty sedans. Our custom dual muffler design hones the tone of the engine into an ear-pleasing symphony. Purposefully delivering a crisp, clean, deep rumble at idle and an aggressive roar when you're pushing the limits. Manufactured from only the highest grade 304 stainless-steel, from the flanges to quad titanium look tips, for the highest level of tensile strength and rust resistance. The premium polished finish on the mufflers is sure to impress anyone curious enough to peek at the undercarriage and the burnt titanium look exhaust tips offer superb aesthetics that perfectly compliment the sound of the system itself.