Megan Racing Downpipe for the 2006+ Honda Civic EX 2/4dr made of durable T-304 Stainless Steel and polished to a mirror finish. This Downpipe replaces the OEM exhaust piping with all of it s restrictive bends while increasing the inner diameter of the pipe; this greatly increases the exhaust flow and reduces the turbulence within the system freeing up high-end horsepower and mid-range torque. The missing link to your exhaust system; this downpipe will give you that competetive edge that you ve been looking for. - T-304 Stainless Steel - 2.25" Piping - Smooth bends improve flow and performance. - not for Si version (Note: Off-Road Use Only)