Cat-Back. 60mm Piping. 101mm TipFor a good balance of price and performance, Invidia offers the motorsports enthusiasts a strong line-up of Invidia N1 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 sxhausts are engineered to produce strong mid to top-end power gains, as well as an increase in horsepower and torque.