40 Series Stainless Steel - 3.00 Center In / 2.50 Dual Out - Aggressive Sound 1957-chevrolet-corvette-esi1097428 Valve Spring - Dual Spring

Valve Spring - Dual Spring - 250 lb/in Spring Rate - 0

5312 in OD - 1

Rod End - Pro Series - Spherical - 1/2 in Bore - 5/8-18 in Left Hand Male Thread - Chromoly - Black Oxide - Each

125 in D - Passenger Side Inlet - Driver Side Outlet - Aluminum - Natural - Universal - Each

40 Series Stainless Steel - 3.00 Center In / 2.50 Dual Out - Aggressive Sound 1957-chevrolet-corvette-esi1097428 Valve Spring - Dual SpringThe 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 409S stainless steel and fully MIG welded for maximum durability.