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Flowmaster 40 Series Delta Flow Muffler

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List Price:$128.00 - $140.00
Our Price:$114.95 - $125.95
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  • Creates a very aggressive tone that sounds great on vintage and late model vehicles
  • Baffled internal chamber that increases horsepower and torque with unrestricted exhaust flow
  • Chambered internal design tunes your exhaust note and reduces interior drone and resonance
  • Available in aluminized steel finish or 409 stainless steel for enhanced corrosion resistance
  • 40 Series Delta Flow muffler is Flowmaster's original design - and has been trusted for over 25 years
  • Made in the USA - Santa Rosa, CA

The 40 Series Delta Flow muffler utilizes Flowmaster's original design, developed over 25 years ago. It's chambered internal design offers a deep, powerful tone that screams performance for your car or sport truck. The 40 Series muffler's internal design tunes your vehicles exhaust tone for that unmistakable "Flowmaster" sound. It also allows for unrestricted exhaust flow increasing torque and horsepower numbers. The 40 Series Delta Flow muffler has a case dimension of 13"L x 9.75"W x 4"H, and and overall tip to tip length of 19". They are available for 2"-3" exhaust systems. Flowmaster offers the 40 Series mufflers in aluminized steel as well as 409 Stainless Steel for unmatched corrosion resistance.

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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 Delta Flow Mufflers and a 3 year limited warranty on the aluminum 40 Series Delta Flow Mufflers.