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Home  /Performance  /Exhausts & Mufflers  /Mufflers  /Flowmaster 70 Series Big Block II Mufflers

Flowmaster 70 Series Big Block II Mufflers

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List Price:$195.00 - $206.00
Our Price:$174.95 - $184.95
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  • Soft, Mellow Tone: The 70 Series Big Block II muffler offers a nice soft rumble that sounds nice without being offensive. It is recommended for daily driving and towing applications.
  • Longer Case Design: The 70 Series muffler features a narrower and longer case design to work on vehicles where a 50 Big Block II muffler won't work. It is recommended for cars, trucks, SUVs, RVs, and other vehicles.
  • Delta Flow Technology: Flowmaster's Delta Flow Technology ensures unrestricted exhaust flow while providing superior sound dampening capabilities. Interior resonance is virtually eliminated for a quiet, comfortable ride.
  • Increased Fuel Economy: The longer case design of the 70 Series Big Block muffler ensures unrestricted exhaust volume for increased power and fuel mileage.
  • Aluminized Steel or Stainless Steel: The Flowmaster 70 Series Big Block mufflers are constructed of heavy duty aluminized steel or stainless steel for long lasting durability.
  • Made in the USA - Santa Rosa, CA

The 70 Series Big Block II Mufflers from Flowmaster are designed to offer increased performance while offering a deep, mild tone that won't offend the neighborhood. The 70 Series muffler is very similar in performance and tone to the 50 Series Big Block, however it uses a longer case design that works well on applications where the wider muffler won't work.

The 70 Big Block uses Flowmaster's Delta Flow technology to maximize efficiency and dampen interior resonance making it one of Flowmaster's quietest mufflers. It is designed for most cars, trucks, SUVs, & RVs with 2.5" or 3" exhaust systems. The 70 Series Big Block muffler has a case dimension of 22"L x 10" W x 5" H and a total length of 28". It is constructed of 16 gauge aluminized steel or T409 stainless steel for extended durability and life.

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Spec Sheet
MATERIALAluminized Steel
California Residents: Prop 65 Warning



Flowmaster mufflers are designed to work with new or existing exhaust systems. They offer slip on installation and can be welded or clamped into place. Due to the use of heavier materials,Flowmaster recommends spot welding the joints when using clamps. On some applications it will be necessary to cut or splice when adding Flowmaster mufflers to an existing exhaust system.


Flowmaster is offering a 3 year limited warranty on the aluminum 70 Series Big Block II Mufflers.