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 our aggressive ATAK(r) sound level and dual 4.25" x 2.5"oval polished T-304 stainless steel tips on each side. BORLA(r) Cat-Back(tm) & Axle-Back multi-core technology is 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.