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Flowmaster 40 Series Original Muffler

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List Price:$99.96 - $114.00
Our Price:$89.96 - $101.95
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  • The original high performance Flowmaster® muffler
  • Aggressive sound for the enthusiast who like their exhaust LOUD
  • Available in either aluminized steel or 409S Stainless
  • Stainless steel mufflers covered by limited lifetime warranty
  • Aluminized steel mufflers covered by a 3 year warranty
  • Fully MIG welded 16 gauge steel for durability

This is the muffler that started it all – the myth, the legend, the Original Flowmaster Series 40 Muffler. This muffler is not for the faint of heart, or those with sensitive ears. This muffler is for the person who wants to hear every single horsepower pushing through their vehicle.

The Flowmaster 40 Series is the most recognizable muffler in the American V8 industry, delivering a classic muscle tone. The 40 series comes in a variety of configurations, pipe sizes and materials, to make absolutely sure you find the perfect muffler for your exhaust configuration.

Backed by either a lifetime warranty (for stainless steel) or a 3 year warranty (for aluminized steel) you know that this muffler will never leave you stranded and sound incredible for years to come. Available with free shipping at

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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 lifetime limited warranty on their stainless steel 40 Series Original Mufflers and a 3 year limited warranty on the aluminum 40 Series Original Mufflers.