Flowmaster 40 Series Delta Flow Muffler

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Delta flow exhaust muffler Mild to moderate aggressive tone Two chamber design Available in two materials Fully welded and durable material Made in the USA

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We believe in doing right by our customers, no matter what it takes.

In keeping with that, we offer a “perfect fit guarantee” that ensures your satisfaction on 3 levels: low price, free shipping, and perfect fitment.

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Our “free shipping both ways” policy means that returns and orders ship free of charge. When you place an order, you pay only the list price and any applicable taxes. We cover the shipping to save you money and ensure timely delivery.

100% Guaranteed to Fit

In the highly unlikely event of a fitment problem, we’ll return your purchase at no cost to you. We pay return shipping on all orders, so it won’t cost you a penny to send back a defective part.


  • High performance and efficient delta flow technology
  • Baffled internal chamber with impressive horse power with unlimited exhaust flow
  • Mild to moderate aggressive tone for the ultimate thrill
  • Two chamber design ideal for dual-exhaust and off-road vehicles
  • Available in two materials: stainless steel and aluminized steel
  • Fully welded and durable material for strength and toughness
  • Manufacturer's warranty that guarantees quality with no defects
  • Made in the USA with authenticity and quality
Delta flow exhaust muffler

Delta flow exhaust muffler

The Flowmaster delta flow muffler uses the delta flow technology to ensure that you get optimum performance without too much resonance. It reduces interior exhaust noises for a quieter and more comfortable ride.

Optimum performance

Optimum performance

The baffled internal chamber allows optimal horsepower without restricted exhaust flow. This allows maximum performance and ensures that you get the most out of your muffler for the ultimate driving experience.

Mild to moderate aggressively tone

Mild to moderate aggressively tone

The muffler lets out mild to moderately loud sounds. This makes for a more comfortable ride with the full thrill of an aggressive engine.

Ideal for dual-exhaust vehicles

Ideal for dual-exhaust vehicles

The two-chamber design makes the Flowmaster delta flow muffler particularly ideal for dual-exhaust vehicles. It is also perfect for street cars and trucks.

Available in two options

Available in two options

The mufflers are available in either stainless steel or aluminized steel. Choose the construction that best suits your car exhaust needs.

Fully welded and durable to last long

Fully welded and durable to last long

The crafters fully weld the muffler so that it stays tough and lasts long. The steel is resistant to corrosion and rust, so you are assured of full service for years as long as you practice proper care and maintenance.

Manufacturer's guarantee of quality

Manufacturer's guarantee of quality

The manufacturer provides a limited lifetime warranty for every purchase of the stainless steel mufflers, and a three-year warranty for the aluminized steel mufflers. It is a guarantee that they are made with quality, will provide optimum performance, and have no defects.

Made in the USA

Made in the USA

The Flowmaster delta flow muffler is proudly made in the USA. The manufacturer tests the material thoroughly to ensure authenticity and performance. The industry employs thousands of Americans every year, ideally contributing to the growth of the economy.

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Lifetime Limited Warranty applies to Flowmaster stainless steel mufflers (excluding FlowFX series).
Three (3) Year Limited Warranty applies to Flowmaster aluminized steel mufflers.
Part Numbers

The following part numbers are available in this product line:

842541, 842543, 8430402, 843041, 942040, 942041, 942042, 942043, 942441, 942442, 942443, 942444, 942541, 942542, 942543, 9430402, 943041, 9430422, 943043

To purchase this product for your vehicle, please select the Year, Make and Model of your vehicle at the top of this page.

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