Flowmaster Flow FX Muffler 2007-gmc-sierra-2500-hd-esi3454831 250 in Bore - File

250 in Bore - File Fit - 5/64 x 5/64 x 3/16 in Thick - Standard Tension - Ductile Iron - Plasma Moly - 8-Cylinder - Kit

Crate Engine - LS3 - 430 HP - GM LS-Series - Each

Body Reinforcing Plate - Large 1-3/4 in Diameter - Aluminum - Natural - Quick Release Fastener - Set of 10

Spark Plug Wire Set - Ultra - Spiral Core - 8 mm - Sleeved - Black - 90 Degree Plug Boots - Socket Style - Under The Header - Big Block Chevy - Kit

625 in Bolt Circle - Steel - Purple Paint - GM - Each

Flowmaster Flow FX Muffler 2007-gmc-sierra-2500-hd-esi3454831 250 in Bore - FileFlowmaster's Flow FX series mufflers deliver a moderate performance tone for the enthusiast looking for an exhaust note that is different from the "chambered" muffler sound. The interior features a large "straight through" stainless steel perforated core, surrounded with high temperature sound absorption materials delivering a deep mellow tone. The internal flow design is reversible, so the muffler can be installed in either direction to best suit the