Invidia N1 Cat Back Exhaust for 2006 2011 Civic Si Invidia N1 Exhaust Honda Civic 1.5T Coupe Sedan (16 21) Catback w T Invidia N1 Exhaust System for 11th Gen Honda Civic Invidia N1 Titanium Tip Cat Back Exhaust System fits 12 15 Honda Civic. 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.