Flowmaster 70 Series Big Block II Muffler - 3" Center Inlet/Outlet HSXSM11SAS 2000 / 4800 RPM

2000 / 4800 RPM

615 in Head

1965-1966 GMC I1500

Does not fit LT1/LT4

these full length headers provide an exact fit and increased performance

Flowmaster 70 Series Big Block II Muffler - 3" Center Inlet/Outlet HSXSM11SAS 2000 / 4800 RPMThe 70 series utilizes Flowmaster's patented Delta Flow technology and an enlarged case for improved sound control along with mileage and power gains. Perfect for use on trucks, SUV's, RVs, tow vehicles and high performance street cars where space allows. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability. Features: Durable Fully Welded 16 Gauge Aluminized Steel 3 Year Limited Warranty Stock to Mild Exterior Exhaust