The BORLA(r) Cat - Back(tm) is the perfect addition to the tenth generation Honda Civic Si. Our Cat - Back(tm) systems for the Honda Civic Si are specifically tuned for the car's 1.5L Turbo engine and are designed for easy, bolt - on installation. Our S - Type sound level delivers a sound that is much sportier than the barely audible factory exhaust. This particular system has been designed to fit the Civic Si Sedan and features dual 4.25 Intercooled T - 304 Stainless Steel Tips with a polished finish. To top it off, our systems are drone - free and made with premium, high - quality T - 304 austenitic stainless steel to give you unmatched durability. Best of all, it comes with BORLA(r)'S Million - Mile warranty.