O.E. system NEEDS to be cut to install Borla(r) system. This system has Dual Mode NPP valves and is specifically tuned for use on the ZL1 Camaro. It features an X-Pipe for improved performance the S-Type sound level and 4" Carbon Fiber tips with black anodized centers. A system with polished T-304 stainless steel tips is also available. Borla(r) Cat-Back(tm) & Axle-Back exhaust systems feature patented straight-through and multi-core technology designed 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. Each system is built from premium T-304 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 Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.