For a good balance of price and performance, Invidia Exhaust 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. New from Invidia is a new down-pipe to suit the 2015 WRX with the FA20DIT. Removing the restrictive OEM down-pipe frees up a lot of horsepower but is recommended to have the car tuned when fitted.