MagnaFlow XL Performance is the midlevel performance diesel system featuring a satin finish stainless steel muffler and mandrel-bent stainless steel tubing with a single walled tip. Offered in a "turbo-back" or "cat-back", all of MagnaFlow Diesel systems are proven to make significant gains in power. All systems include a stainless steel, straight-through wide open performance muffler, 100% stainless steel tubing, and all the necessary hardware to complete the job like a pro. PartNumber : mag16915 Description : SYS C/B XL 08 GM Duramax 6.6L 4in. Du Exhaust Type : Dual Exit Position : Dual Side Rear Exit Style : Straight Inlet Size (in.) : 4 Material : Stainless Steel Outlet Size (in.) : 5 System Type : DPF Back Tip Size : 5 in. Muffler Type : Straight-Through Inlet Inside Diameter (in.) : 4 Outlet Outside Diameter (in.) : 5 Tubing Diameter : 4.00 in. WARNING CA Proposition 65 : No Outlet Outside Diameter : 5 Piping : 3.50in Muffler : 7x7x14.00in Tip Style : Dual Tip Size : 5.0in Inlet Inside Diameter : 4.000 in. 2007-2008 Chevrolet Silverado 2500 HD LT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 2500 HD LT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2008 Chevrolet Silverado 2500 HD LTZ V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 2500 HD LTZ V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2008 Chevrolet Silverado 2500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 2500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2008 Chevrolet Silverado 3500 HD LT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 3500 HD LT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2008 Chevrolet Silverado 3500 HD LTZ V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 3500 HD LTZ V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2008 Chevrolet Silverado 3500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 Chevrolet Silverado 3500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 2500 HD SLE V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 2500 HD SLT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 2500 HD SLT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 2500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 2500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 3500 HD SLE V8.6599cc Exhaust, Mufflers & Tips::Catback 2008-2010 GMC Sierra 3500 HD SLT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 3500 HD SLT V8.6599cc Exhaust, Mufflers & Tips::Catback 2008-2010 GMC Sierra 3500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2007-2010 GMC Sierra 3500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback