BORLA(r) has once again set the pace in the Corvette performance exhaust world. This 2.5" diameter into the mufflers with dual 2" out Cat-Back(tm) system features the S-Type II systems which uses the latest muffler design to eliminate sound frequencies often associate with resonance or drone. The system features dual 4.25" x 3.5" oval polished T-304 stainless steel tips on each side. 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. The S-Type II systems use an advanced muffler design to eliminate sound frequencies are often associated with resonance or drone. 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. 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.