The 70 Series Big Block II is designed using a large Flowmaster case for maximum volume and efficiency. The case is two inches narrower than Flowmaster's original Big Block Muffler, making for easier installation in tight applications. The 70 Series offers a mild mellow exhaust tone and incorporates a Resonant Tuning Chamber for reduced interior sound levels.

Application Recommendations:

• Best suited for truck applications - quiet operation!
• Features three-chamber, Delta Flow Technology
• Constructed of 16-guage aluminized or 409S stainless steel!
  
• Fully Mig-welded for maximum durability!

70 SERIES BIG BLOCK II 28.00" OAL X 22.00" CASE X 10.00" WIDE X 5.00" THICK
In Out Part Number 2.50" 2.50" 52570 3.00" 3.00" 53070 409S STAINLESS STEEL 3.00" 3.00" 853070	In Out Part Number 2.50" 2.50" 52571 3.00" 3.00" 53071 409S STAINLESS STEEL 3.00" 3.00" 853071	In Out Part Number 2.50" 2.50" 52572 3.00" 3.00" 53072 409S STAINLESS STEEL 3.00" 3.00" 853072
70 SERIES BIG BLOCK II 28.00" OAL X 22.00" CASE X 10.00" WIDE X 5.00" THICK
In Out Part Number 2.50" 2.50" 52573 3.00" 3.00" 53073 409S STAINLESS STEEL 3.00" 3.00" 853073	In Out Part Number 2.25" 3.00" 524703	In Out Part Number 3.00" 2.25" 530722 3.00" 2.50" 530702 409S STAINLESS STEEL 3.00" 2.50" 8530702
70 SERIES BIG BLOCK II 28.00" OAL X 22.00" CASE X 10.00" WIDE X 5.00" THICK
In Out Part Number 3.00" 2.50" 530712	In Out Part Number 2.25" 2.25" 524704	In Out Part Number 2.50" 2.50" 52574 3.00" 3.00" 53074