This system does NOT include AFM or NPP valves. It is intended for vehicles that are either NOT equipped with AFM and NPP or have the AFM and NPP disabled. System has non-functioning mounts where AFM actuators can be mounted if the vehicle had them. A Check Engine Light will occur on vehicles equipped with AFM. This system features the aggressive ATAK(r) sound and exits through 4.25" polished T-304 stainless steel tips. 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. 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. Borla(r)'s C7 Corvette Axle-Back exhaust systems are covered under our Million-Mile Warranty for non-moving parts the exhaust valves are warrantied for 1 year. Failures of original equipment AFM and NPP actuators are not covered by the Borla(r) warranty