FLO-PRO 601NM 6.6L GMC Diesel Exhaust Kits (2001-2007), 2500/3500 LB7-LLY-LBZ, Race Pipe 5-Inch Downpipe Back Single ALUMINIZED NO MUFFLER KIT FOR ENGINE TYPE LB7-LLY-LBZ FOR CAB TYPE EXTENDED/CREW FOR BED TYPE SHORT/LONG/DUALLY