This 2.5 in. diameter Borla Cat-Back system is the perfect addition to Civic Sport Touring vehicles. Our Cat-Back system is specifically tuned for the 1.5L turbocharged engine and is designed for easy, bolt-on installation. It features Borla's Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound. Our classic S-Type sound level delivers a sporty sound that enhances the driving experience without any drone inside the vehicle. The system features a 2.5 in. tail pipes that exit thru the O.E. tips/valance. Tips NOT included. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. 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's Million-Mile warranty. System Features: