EXCEPT Dual Mode Exhaust (NPP) or Dual Split Rear Exit Bumper. It may be used with the dual tip lower bumper cover to convert a single, split rear exit to a dual split rear exit. It features a durable high-temperature Ceramic Black finish on T-304 stainless steel tips. The ATAK is our most agressive sounding system. BORLA Cat-Back and Axle-Back multi-core technology is designed 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, high-quality austenitic 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.