This Invidia N1 Catback Exhaust with Polished Tip for the 2015+ WRX/STI is constructed with high-quality SUS304 stainless steel, CNC-machined flanges, and manufactured with a polished finish. Each system features mandrel-bent stainless steel piping for maximum exhaust flow and reduced back pressure. These exhausts are engineered to produce strong mid to top-end power gains, as well as an increase in horsepower and torque for your 2015+ Subaru WRX/STI.