The Invidia R400 Gemini Single Layer Quad Titanium Tip Cat Back Exhaust for your Subaru WRX / STI 2015-2018 is among one of the most popular cat-back exhaust systems available as they make for an excellent upgrade over the OEM exhaust system to improve the performance and the sound. The combination of increased piping diameter along with smooth bends relieves the exhaust with restriction and turbulence under acceleration which will increase the horsepower, the torque, all while improving the throttle response and reducing the turbo lag.

Here are the key features:

• Titanium quad exhaust tips
• 4″ Tip sizing
• 304 stainless steel materials
• 3″ piping diameter
• Exhaust hangers welded on to the OEM locations to allow for a direct fitment
• New gaskets and hardware included making this exhaust system ready for the installation

Pipe: 76mm
Tip: 101mm
Resonated mid-pipe