This 2.25" True Dual BORLA® Cat-Back™ system was designed specifically for the Frontier equipped with 3.8L engine. The muffler contains an internal H-Pipe for increased performance and improved sound. The system features an updated version (compared to 140919) of the classic S-Type sound that delivers a powerful performance sound with no drone. The system has 2 full Tail Pipes (Not a single tail pipe with dual tips). It features a single 4" round black chrome on T-304 stainless steel tip on each tail pipe. Using BORLA® Stainless Steel Polish p# 21499 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. A system is also available with bright chrome on T-304 stainless steel tips. A High Clearance Climber / Rock Crawler system is also available. BORLA® Cat-Back™ & 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® Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium, high-quality T-304 austenitic stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. The entire system is made of T-304 stainless steel and utilizes computer numerical control (CNC) manufacturing techniques that ensure an accurate fit. All this is backed by our unsurpassed Million Mile Warranty.