mufflers

Flowmaster 425404 - Exhaust Muffler

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$79.95

$88.83

You save: $8.88 (10%) off MSRP

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This product is currently unavailable.

This is a universal fit product

  1. That means this product doesn’t have fitment for any specific vehicle.
  2. If fitment is applicable for your application, be sure to check compatibility with the other components.
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About this product

Part #: 425404

The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound, this is the muffler for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.

More Details

Body Height4.000 in.
Body Length13.000 in.
Body Width9.500 in.
Inlet Connection TypePipe
Inlet Diameter2.500 in.
Inlet Inside Diameter2.500 in.
Inlet Outside Diameter2.500 in.
Inlet PositionDual
Inlet TypeDual
Main Piping DiameterOEM
MaterialAluminized Steel
Muffler SeriesOriginal 40 Series
Outlet Diameter2.500 in.
Outlet Outside Diameter2.500 in.
Outlet PositionDual
Outlet TypeDual Outlet
Overall Length19.000 in.
ShapeOval
Sound LevelAggressive
Tip Quantity0
TitleFlowmaster 425404 40 Series Muffler - 2.50" IN(D)/OUT(D) - Aggressive Sound
Additional Documents
  1. Certificate of Originpdf
  2. Warrantypdf

See what our community says about flowmaster products

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What made you choose this particular product?
This part was already in the truck, but it gives the truck a nice rumble.
View on Cesar's build
Andrew Allen

346

Andrew Allen
1985 GMC Jimmy
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Sound Amazing
View on Andrew's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
Was it easy to install? Any installation tips that will help others?
Go to a muffler shop.
Once you've had a chance to use the product, did it meet your expectations?
Yes very much so, it's been on my Durango since 2013.
View on Ron's build
Connor Jones

120

Connor Jones
1973 Dodge D250
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Seem nice. But they’re pretty close to the transmission
View on Connor's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Wanted a more aggressive sound over stock
Is this your first time buying from this brand? Did you consider other brands?
yes, no
Was it easy to install? Any installation tips that will help others?
mechanic
Once you've had a chance to use the product, did it meet your expectations?
yes, although I wish idle sound was better
View on Will's build
California prop 65 warningWARNING: Cancer and Reproductive Harm www.p65warnings.cs.gov

*Some manufacturer restrictions apply.

About Flowmaster

Manufacturer of performance exhaust systems, mufflers, cold air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels.

shipping-worldwide from warehouse

we ship worldwide!

Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.

+ FREE GROUND SHIPPING ON U.S. ORDERS OVER $99
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Have a question? Ask an Expert!

Finding the best parts can be tricky

- but not to worry! Our team of experienced American Muscle, JDM, Euro, and off-road tuners are ready to answer your questions (as long as we’re not in the garage wrenching on our own builds).

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What do you get when you mix Facebook, Amazon, and your favorite online car forum? You get Wheelwell.com.

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Hot Rod Magazine

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Wheelwell helps you organize all your stuff for your car, I’ve loaded all my cars on Wheelwell and you can see all the parts I’ve put in them and that may help you make a decision with your own build.

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Matt Farah

The Smoking Tire / The Drive

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This is an awesome new site where enthusiasts can get together and figure out what products work best on their ride.

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