40 Series - 2.25 Offset In / 2.25 Center Out - Aggressive Sound 1977-gmc-c15-esi6377310 Differential Cover - Reinforced -

Differential Cover - Reinforced - Main Cap Bolts / Magnetic Drain Plug Included - Aluminum - Gray Crinkle Powder Coat - GM 12-Bolt - Each

Quick Release Adapter - 3000 Series - Straight - 8 AN Male to Quick Release Socket - Valved - FKM Seal - Aluminum - Black Anodized - Each

Camshaft - FSL - Hydraulic Roller - Lift 0

Throttle Body Gasket - Composite - Edelbrock 65/70 mm Throttle Body - Small Block Ford - Each

1 - Aluminum / Steel - Black - Internal Balance - GM LS-Series - Each

40 Series - 2.25 Offset In / 2.25 Center Out - Aggressive Sound 1977-gmc-c15-esi6377310 Differential Cover - Reinforced -The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.