This Axle-Back system includes both AFM and NPP valves. Optional systems are available as well as systems without NPP and systems without AFM or NPP. This system is for vehicles that come from the factory with single tips and are NOT equipped with NPP (dual mode exhaust). Borla Cat-Back And Axle-Back multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla 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-controlled CNC manufacturing ensures an accurate fit. Best of all, Borla 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. Features a durable high-temperature Ceramic Black finish on the tips. Borla's C7 Corvette Axle-Back exhaust systems are covered under our Million-Mile Warranty for non-moving parts, the exhaust valves are warrantied for 3 years. Failures of original equipment AFM and NPP actuators are not covered by the Borla warranty.