Flowmaster Mufflers 40 Series American Thunder

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Center Inlet / Dual Outlet
Ships between 08/20/2008 - 08/21/2008

Offset Inlet / Center Outlet
Select options to see availability.

Offset Inlet / Offset Outlet
Select options to see availability.
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Features

  • The Flowmaster 40 Series Muffler takes the checkered flag as Flowmaster's most aggressive-sounding muffler
  • Quality Flowmaster muffler crafting uses aluminized steel for corrosion resistance and precise mig welds for maximum durability
  • The Flowmaster 40 Series is highly recommended for early muscle cars, off-road and race vehicles and dual-exhaust rides
  • Hear the power of your engine with the excellent interior resonance of the 40 Series—especially at 1800-2000 RPMs and again at 2400-2600 RPMs
  • Original two-chamber design maximizes horsepower and torque
  • The centerpiece muffler for many Flowmaster American Thunder Exhaust Systems
  • Casing embossed with the Flowmaster name
  • Your Flowmaster 40 Series Muffler carries a 3-year warranty

Description

Get the original aggressive Flowmaster sound that puts serious punch into your vehicle’s presence and power. The Flowmaster 40 Series Muffler maximizes horsepower, torque and flow with its two-chamber design—the original two-chamber Flowmaster muffler.

If the roaring sound of an engine is music to your ears, you’ll love the Flowmaster 40 Series. Aggressive sound is maximized outside, while high-volume interior resonance lets you hear every push of the pedal. It’s this total sound design that makes the Flowmaster 40 Series the centerpiece of many of Flowmaster’s outstanding American Thunder Exhaust Systems.

Ideal for early muscle cars, off-road rides and dual exhaust cruisers, the Flowmaster 40 Series boasts the quality construction you’d expect from Flowmaster. Each Flowmaster Muffler is built with 16-gauge aluminized steel for corrosion resistance and fully mig-welded for maximum durability. Best yet, your Flowmaster 40 Series Muffler boasts a 3-year warranty.

Notes

  • Flowmaster 40 Series American Thunder Mufflers come in a variety of inlet/outlet configurations and sizes, shown above. Select the inlet/outlet diameter you need from the drop down at right.

Flowmaster Mufflers 40 Series American Thunder Customer Reviews

Average Customer Rating

  (32)
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Truly American THUNDER!

Posted on 06/23/2006 by Samuel V. (Ocean Pines,MD)

"Great replacement for the hum-drum stock mufflers. With my 5.4l, this tube rocks my Expediton. WOW!"

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About Samuel V.
 
40 Series

Posted on 06/14/2006 by Paul C. (Phoenix,NY)

"Happy w/ the sound and real easy to install."

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About Paul C.
 
alright

Posted on 03/27/2006 by Brandon A. (Littleton,CO)

1 of 1 people found the following review helpful.

"its alright i thought it would b louder but its not i wish it was"

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About Brandon A.
 
8.1liter/ 40 series muffler

Posted on 03/12/2006 by John F. (Corvallis,MT)

"My new 40 series flowmaster souds awesome on my 8.1 liter chevy avalanche, deep powerful aggresive tone doesnt get any better."

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About John F.
 
Flow and Go

Posted on 02/15/2006 by Craig W. - 1995 Dodge Ram (Louisburg,KS)

1 of 1 people found the following review helpful.

"The flowmaster 40 series was for my son's truck. He was very happy with the results and also the very fast turn around time on this order."

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About Craig W.
Vehicle
1995 Dodge Ram
I use my vehicle for
commuting to school, work and play
 
Outstanding Muffler

Posted on 12/27/2005 by Melanie H. (Acworth,GA)

1 of 1 people found the following review helpful.

"I am very happy with my Flowmaster Muffler 40 Series American Thunder. The sound is better than i expected and the installation was so easy. I highly recomend this muffler for any application."

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About Melanie H.
 
Flowmaster Mufflers 40 Series American Thunder

Posted on 12/24/2005 by Steve S. (Marietta,OH)

1 of 1 people found the following review helpful.

"It is worth every penny"

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About Steve S.
Showing 26 - 32 of 32 Customer Reviews
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