Blackheart Axle-Back Exhaust Kit1997-2004 Chevrolet Corvette C5Dual ExhaustHigh Flow, Straight Through Muffler3 in. Diameter PipingAggressive/Moderate Sound304 Stainless Steel Hooker 70401343-R Blackheart Axle-Back Exhaust System Features:Can reduce weight savings up to 17 lbs. over OE exhaustUp to 47 weight savings over OE exhaust, a savings of 23 LBS. (w/o muffler design) and 7 LBS. (w/ muffler design)Constructed from 3� lightweight, 18-gauge, mandrel bent, 304 stainless steel maximizing strength and durabilityAvailable in a dual, 304 polished stainless steel, high-flow straight through muffler design or a straight through no muffler design4� dual wall, angle-cut, polished 304 stainless steel tips with.