MBRP 2009 Chevy/GMC Yukon XL/Avalanche 5.3/6.0 L Cat Back Single SideOur high flow performance exhaust systems maximize exhaust flow so your engine keeps its cool with lower exhaust temperatures. Your reward will be greater fuel efficiency; more torque; more horsepower; and last but not least a sound that is pure MBRP. XP Series Cat Back Exhaust System; 3 in.; Incl. Ext. Pipe Muffler Over Axle Pipe Tailpipe Hardware 3. 5 in. Tip; Single Side Exit; T409 Stainless Steel; 4" OD Tip Included