This 2.25" True Dual High Clearance Climber / Rock Crawler BORLA(r) Cat-Back(tm) system was designed with ground clearance in mind. It will enhance the power and sound of the Frontier equipped with 3.8L engine. The muffler contains an internal H-Pipe for increased performance and improved sound. The system features the classic S-Type sound that delivers a powerful performance sound with no drone. It features 2 full turn down tail pipes with brushed 2.25" turn down tips. Each tip has a laser cut BORLAÂ logo. Systems with two full tail pipes are also available. 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 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.