ECE approved systems are those that comply with Economic Commission for Europe (according to ECE-R59) rules for motor vehicles, vehicle systems and components. This system will fit Bullitt models. System has Active Valve Exhaust valves. Front muffler/ resonator contains an internal H-Pipe for increased performance and improved sound. BORLA(r) Cat-Back(tm) & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA(r) Sound of Power respected by motoring enthusiasts everywhere. This system comes with 4" bright chrome on T-304 stainless steel tips. Each system is built from premium T-304 austenitic stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA(r) stands behind every system with a Million-Mile in the USA and Canada (1.6 million kilometer). Products sold outside of the USA and Canada carry a 3-year limited warranty.