The S-Type II systems uses advanced muffler design to eliminate sound frequencies are often associated with resonance or drone. This system will fit vehicles with and without NPP. BORLA(r) system does NOT include NPP valves. System contains a Merge X-Pipe for increased power while adding a great sound and dual 4" round polished T-304 stainless steel tips on each muffler assembly for sharp appearance. 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 numeric control (CNC) manufacturing ensures an accurate fit. Best of all BORLA(r) stands behind every system with a Million-Mile Warranty. Just what youâ€d expect from the worldâ€s most experienced (and most winning) exhaust brand.