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 : mag16965 Description : SYS XL 06-GM Duramax CC/SB Duals Exhaust Type : Single Exit Position : Rear Side Exit Style : Straight Inlet Size (in.) : 4 Material : Stainless Steel Outlet Size (in.) : 4 System Type : Cat Back Tip Size : 4.0 in. Muffler Type : Turbo Inlet Inside Diameter (in.) : 4 Outlet Outside Diameter (in.) : 4 Tubing Diameter : 4.00 in. WARNING CA Proposition 65 : No Outlet Outside Diameter : 4 Muffler : 7x7x14.00in Tip Style : Dual Tip Size : 5.0in Piping : 4.00in Inlet Inside Diameter : 4.000 in. 2007 Chevrolet Silverado 2500 HD Classic LT V8.-cc Exhaust, Mufflers & Tips::Catback 2007 Chevrolet Silverado 2500 HD Classic WT V8.-cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD LS V8.-cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD LS V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD LT V8.-cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD LT V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2006 Chevrolet Silverado 2500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 Chevrolet Silverado 2500 HD Classic LS V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 Chevrolet Silverado 2500 HD Classic LT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 Chevrolet Silverado 2500 HD Classic WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SL V8.-cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SL V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SLE V8.-cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SLE V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SLT V8.-cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD SLT V8.6599cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD WT V8.-cc Exhaust, Mufflers & Tips::Catback 2006 GMC Sierra 2500 HD WT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 GMC Sierra 2500 HD Classic SL V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 GMC Sierra 2500 HD Classic SLE V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 GMC Sierra 2500 HD Classic SLT V8.6599cc Exhaust, Mufflers & Tips::Catback 2007 GMC Sierra 2500 HD Classic WT V8.6599cc Exhaust, Mufflers & Tips::Catback