Injen 15-20 Subaru STI Cat Back Exhaust w/ Quad Titanium Tips

If you're looking to give your 2015-2021 Subaru WRX or WRX STI a more aggressive sound and a distinct look, this Injen cat-back exhaust system is a solid choice. It's built to complement the sporty nature of these cars, aiming to refine the engine's tone into something more engaging, from a deep rumble at idle to a roar when you step on it.

This system is constructed from 304 stainless steel, which is known for its strength and resistance to rust, from the flanges all the way to the quad titanium-look tips. The mufflers have a polished finish, and the burnt titanium look on the tips adds a nice visual touch that matches the improved sound. Injen designed this system with ease of installation in mind, using V-band clamps and flanges so there's no cutting or drilling required. It bolts right up to the factory mounting points. The piping uses a stepped design, starting at 76mm and going down to 60mm, which helps maintain a consistent flow rate throughout the exhaust. This not only contributes to performance gains, but also helps keep the exhaust note consistent across the RPM range. Dyno testing showed an increase of 13 horsepower and 11 lb-ft of torque at the wheels.

This exhaust is a straightforward way to add both personality and a bit more power to your WRX or STI. It comes with all the necessary stainless steel hardware and hangers, and the quad tips can be installed in a staggered or straight configuration.