The Greddy Supreme SP exhaust system for the 10th gen Honda Civic Si Coupe features a dual muffler system that provides a deep growl for an exhaust note when using lots of throttle input but stays refined and classy when cruising and at light throttle. This exhaust bolts right up to the factory midpipe (commonly called front pipe on the Honda Civic). Piping expands to 76mm or 3 inches to give plenty of room for the turbo to breathe and reduce back pressure in the engine. 304 stainless steel material is used to keep the exhaust in great shape in all conditions. The unique dual mufflers are very noticeable in the rear of the car and will definitely set your 10th gen Honda Civic Si apart from the rest.