Flowmaster 40 Series Muffler

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Fitment Info

High performance exhaust muffler Aggressive and deep sound MIG welded Two-chamber design Available in two finishes Manufacturer's warranty

Our #1 value is customer service.

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.

- Alan Marek, Founder of PartCatalog.com

The Lowest Price Anywhere--Guaranteed

At PartCatalog, we’ll beat any competing vendor’s price. And we’re so confident in our rock-bottom prices that we’ll refund the difference if you find a lower price elsewhere.

Free Shipping Both Ways

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 exhaust muffler to reduce noise for a comfortable ride
  • Aggressive and deep sound for racing enthusiast and fans of loud exhaust
  • MIG welded for a durable finish to last long
  • Two-chamber design for dual-exhaust vehicles and race cars
  • Available in two finishes: stainless steel and aluminized steel
  • Manufacturer's guarantee of quality and protection from defects
High performance exhaust muffler

High performance exhaust muffler

The Flowmaster muffler offers excellent noise reduction for a smoother and more enjoyable ride. For a small price, you get a powerful muffler that is guaranteed to be made with the highest quality and engineering.

Aggressive and deep sound

Aggressive and deep sound

If you are a race car driver or a fan of loud exhaust systems, this is the muffler for you. It converts exhaust noise to a deep and aggressively loud sound that will give your drive the thrill it needs.

MIG welded

MIG welded

The craftsmen at Holley use MIG welding to make sure that the result is premium-quality and super durable. The steel is rust-resistant and will add value to your vehicle for years.

Two-chamber design

Two-chamber design

The Flowmaster muffler is ideal for dual-exhaust vehicles. It also works great with muscle and race cars.

Available in two finishes

Available in two finishes

The 40 series muffler is available in either stainless steel or aluminized steel. Both options are of high quality and deliver exceptional performance. You can choose whichever goes best with your taste and exhaust system needs.

Manufacturer's warranty

Manufacturer's warranty

Holley provides a guarantee that your Flowmaster muffler is durable, high-quality, and functional. The manufacturer offers a limited lifetime warranty for the stainless steel muffler and a 3-year limited warranty for the aluminized steel.

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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:

42441, 42443, 42541, 42543, 430402, 43041, 43043, 8042441, 8042443, 8042541, 8042543, 80430402, 8043041, 8043043

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

Buick (1975-1987)

Regal, Skylark

Chevrolet (1963-2013)

Blazer, C10, C10 Suburban, C1500, C1500 Suburban, C20, C2500, C30, Camaro, Caprice, Chevelle, Cobalt, Corvette, Impala, K10, K10 Suburban, K1500, K20, K2500, K30, K5 Blazer, Monte Carlo, R10 Suburban, R1500 Suburban, R20, R2500, S10, S10 Blazer, SSR, Tahoe, V10 Suburban, V1500 Suburban, V20 Suburban

Chrysler (2001-2013)

300, Aspen, PT Cruiser

Dodge (1965-2014)

Challenger, Charger, Coronet, D100, D150, D250, D300, D350, Dakota, Dart, Durango, Magnum, Ram 1500, Ram 2500, Ram 3500, W100, W150, W250, W350

Ford (1960-2014)

Bronco, Excursion, Expedition, Explorer, Explorer Sport, Explorer Sport Trac, F-150, F-150 Heritage, F-250, F-250 HD, F-250 Super Duty, F-350, F-350 Super Duty, Fairlane, Gran Torino, Mustang, Taurus, Torino

GMC (1973-1999)

C15 Suburban, C15/C1500 Suburban, C1500, C1500 Suburban, C2500, Jimmy, K15 Suburban, K15/K1500 Suburban, K1500, K1500 Suburban, K2500, R1500 Suburban, R2500, S15, S15 Jimmy, Sonoma, V1500 Suburban, Yukon

Jeep (1979-1986)

CJ5, CJ7

Lincoln (1998-2010)


Mercury (1967-1974)


Mitsubishi (1990-2007)


Nissan (2004-2007)

Armada, Pathfinder Armada

Oldsmobile (1973-1988)

Cutlass, Cutlass Calais, Cutlass Cruiser, Cutlass Salon, Cutlass Supreme

Plymouth (1965-1974)

Barracuda, Belvedere II, Duster, GTX, Roadrunner

Pontiac (1967-2002)

Firebird, Grand LeMans, LeMans

Subaru (2001-2007)


Toyota (2000-2007)

Solara, Tundra

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