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Flowmaster Original 40 Series Muffler

  • The original high performance Flowmaster muffler
  • Aggressive sound for the enthusiast who likes their exhaust LOUD
  • Available in either aluminized steel or 409SS Stainless Steel
  • Stainless steel mufflers covered by limited lifetime warranty
  • Fully MIG welded for durability

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  • In Stock
Inlet Diameter (in)
  • 2.25
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  • 3
Outlet Diameter (in)
  • 2.25
  • 2.5
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  • Classic Muscle Car
  • Late Model Muscle Car
  • Street Rod
  • Street/Strip
  • Truck/SUV
Inlet Position
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  • 409 Stainless Steel
  • Aluminized Steel
Outlet Position
  • Center
  • Dual
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    40 Series Original

    The muffler that started it all, the original 40 Series Muffler is an aggressive sounding street/strip muffler that delivers a powerful “Flowmaster Sound” you’ve heard so much about it. If you really want to hear your exhaust system and that great muscle car tone – from both inside and out of the vehicle – the 40 Series is for you.