Fitment Information Honda Civic (Si) 2002 2003 2004 2005 Specs & Features Not a bolt-on system; basic welding and fabrication required. May be compatible with engine swaps, however, will require basic welding and fabrication. 70mm Exhaust Product Description Skunk2 MegaPower R exhausts are built for the performance enthusiast who wants a race exhaust system that features maximum exhaust flow and power production.  Skunk2 exhausts feature race sized exhaust piping that results in an exhaust system that is typically louder than most but has very little exhaust flow restriction.  Skunk2 MegaPower R exhausts feature JDM spec N1 exhaust styling and a computer generated exhaust flow pattern that allows exhaust gas to flow at maximum capacity, producing big power gains. Skunk2 MegaPower Exhausts Feature: T304 Stainless Steel Construction Robotically TIG Welded for strength CNC Machined mandrel bends for smooth flow and a precise fit Skunk2 removeable silencer and all necessary hardware is included