Invidia N1 Exhaust Honda Civic 1.5T Coupe Sedan (16 21) Catback w T Invidia N1 Cat Back Exhaust System 2016 2021 Honda Civic 1.5T Sedan Invidia N1 Cat Back Exhaust Resonated Subaru WRX STI GD HS02SW1GTTR Invidia N1 Cat Back Exhaust Titanium Tips installed : r GR86 Invidia N1 Cat Back Exhaust for 2012 2015 Civic Si Models. For 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 for your 2022+ Honda Civic Si 1. 5T Integra Base Piping diameter 70mm Tip diameter 101mm For Off Road Use Only.