70 Series Big Block II Mufflers
70 Series Big Block II Mufflers
The 70 Series Big Block Muffler uses a longer case for increased volume and added sound reduction that will still fit many applications where the wider 50 Series Big Block muffler won’t fit. The 70 Series Big Block utilizes Flowmaster’s patented Delta Flow Technology for maximum efficiency and minimum interior resonance street cars, most trucks, SUV’s, RVs and tow vehicles that require quiet operation with improved sound.

Best suited for truck applications – quiet operation!
Features three-chamber, Delta Flow Technology
Constructed of 16-gauge aluminized steel
Fully MIG-welded for maximum durability
Covered by three year warranty


70 Series Big Block II Mufflers
Part Number IN/OUT Configuration Sound Material
FLO5247042.25/2.25Dual/DualMildAluminized Steel
FLO525712.50/2.50Offset/CenterMildAluminized Steel
FLO525722.50/2.50Center/OffsetMildAluminized Steel
FLO525732.50/2.50Offset/OffsetMildAluminized Steel
FLO530703.00/3.00Center/CenterMildAluminized Steel
FLO530713.00/3.00Offset/CenterMildAluminized Steel
FLO530723.00/3.00Center/OffsetMildAluminized Steel
FLO5247032.25/3.00Dual/CenterMildAluminized Steel
FLO5307023.00/2.50Center/DualMildAluminized Steel
FLO5307223.00/2.25Center/DualMildAluminized Steel
FLO8530723.00/3.00Center/OffsetMildStainless Steel
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