Flowmaster Mufflers 40 Series American Thunder

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Center Inlet / Dual Outlet
Ships between 11/24/2009 - 11/25/2009

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.

Average Customer Rating

  (47)
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Ease of Installation Ease of Installation
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american thunder

Posted on 02/12/2008 by Edna F. - 2002 Ford F350 (Glendale,CA)

"great deep sound. deep mumble."

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About Edna F.
Vehicle
2002 Ford F350
 
Flowmaster 40 American Thunder

Posted on 11/16/2007 by Monty Y. (Placentia,CA)

7 of 7 people found the following review helpful.

"The muffler was shipped promptly. It does give my 3.7l Dakota a beefier sound but not as loud as some say it is... maybe that just because I only installed the muffler and tip without pipes or anything. All in all a great buy."

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About Monty Y.
 
THE SOUND

Posted on 11/01/2007 by Steve K. - 1998 Dodge Dakota (Helena,MT)

9 of 9 people found the following review helpful.

"Sounds good. Deep and Mellow. Easy to instal."

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About Steve K.
Vehicle
1998 Dodge Dakota
I use my vehicle for
Driving
 
very impressive sound

Posted on 08/22/2007 by Richard L. - 1989 Chevy C/K 1500 (Kewaunee,WI)

7 of 7 people found the following review helpful.

"Awsome low range sound,and fairly quiet at hiway speed. great product!"

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About Richard L.
Vehicle
1989 Chevy C/K 1500
I use my vehicle for
towing my sons race car
 
One word: badass!!

Posted on 04/27/2007 by Dan D. - 2003 Chevy Silverado (South Burlington,VT)

14 of 15 people found the following review helpful.

"I hooked up a single 3" in, duel 2.5" out muffler with 3 inch chrome tips and it sounds greater than I ever imagined. I've started a new trend at college. I've heard them on the internet, but since I have them on my truck, i still can't get over the deep throaty sound! When I leave, people know it! Now that the system is broken in the tone is just immense! I have gotten better gas milage and acceleration too! I only use and 1/8 of a tank to go 50-60 miles to school now, instead of a 1/4 tank. And I have a 2003 silverado 1500 with a 327 vortec. The interior sound is a little lound when shifting from 1st to 2nd but after that you just her a rumble. There is a drone at 65 mph and on, but not too bad. Again, I can't say enough about my flows!"

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About Dan D.
Vehicle
2003 Chevy Silverado
I use my vehicle for
commuting
 
SOUND PERFESTION

Posted on 04/11/2007 by Mike B. (Peoria,AZ)

9 of 9 people found the following review helpful.

"IT HAS THE SOUND I WAS LOOKING FOR.ON MY CORVETTE 6 SPEED. AND I WILL ADD,A VERY GOOD PRICE.THANKS, MIKE"

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About Mike B.
I use my vehicle for
CAR SHOWS AND CRUISNG
 
Awesome Sound

Posted on 03/26/2007 by Antonio O. - 1999 Ford F150 (Shawnee,OK)

9 of 9 people found the following review helpful.

"Very pleased with the sound, and extra gas mileage about 60 more miles on a tank of gas."

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About Antonio O.
Vehicle
1999 Ford F150
I use my vehicle for
Pleasure
 
flowmaster 40

Posted on 03/13/2007 by Sean M. - 2004 Ford F150 (Valrico,FL)

"i put this muffler on my 04 f150 4.6, sounds great. Gets fairly loud. I suggest letting some one drive your ride while you watch so you can really give the exhaust a rating."

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About Sean M.
Vehicle
2004 Ford F150
I use my vehicle for
fun
 
Flowmaster Muffler 40 Series American Thunder

Posted on 02/13/2007 by Jeremy A. - 2001 Ford Ranger (Monroe,LA)

6 of 6 people found the following review helpful.

"I got just what I expected. The sound is awesome. You can't beat the Flowmaster sound."

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About Jeremy A.
Vehicle
2001 Ford Ranger
I use my vehicle for
Everything
 
97 Dodge Dakota

Posted on 01/03/2007 by Justin G. - 1997 Dodge Dakota (Branchville,NJ)

4 of 4 people found the following review helpful.

"Excellent muffler. Great sound, installed in twenty minutes. Great results and performance. Would recommend it to anyone looking for performance and deep sound."

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About Justin G.
Vehicle
1997 Dodge Dakota
I use my vehicle for
work
 
American THUNDER!

Posted on 10/09/2006 by Matthew N. (El Paso,TX)

3 of 3 people found the following review helpful.

"Perfect sound, deep and powerful and not annoying. Definate gains in gas mileage and horse power! Noticed around 20-30 extra miles to my tank, was not expecting such a high increase! Will buy another for dual exhaust!"

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About Matthew N.
I use my vehicle for
Everything
 
98 Dodge Ram 1500

Posted on 09/26/2006 by Theresa C. - 1998 Dodge Ram (New Milford,CT)

2 of 2 people found the following review helpful.

"Half hour installation, excellent sound. Great product, would highly recommend it to anyone."

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About Theresa C.
Vehicle
1998 Dodge Ram
I use my vehicle for
Commuting, school, work
 
amercan thunder i guess!!!!!!!!

Posted on 09/08/2006 by Charles M. - 1998 Chevy C/K 1500 (Tupper Lake,NY)

"the american thunder incresed horsepower and responce at the gas pedel i am very pleased with my choice thank you"

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About Charles M.
Vehicle
1998 Chevy C/K 1500
I use my vehicle for
everything
 
Opinion on muffler.

Posted on 08/07/2006 by Steven H. (Otway,OH)

2 of 2 people found the following review helpful.

"This muffler has a deep high performance, throaty sound. It is very great and I am extremely happy with it."

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About Steven H.
 
The Flowmaster is awesome

Posted on 07/12/2006 by Mark C. - 2001 Toyota Tacoma (Broomall,PA)

4 of 4 people found the following review helpful.

"This sounds great in my 01 Tacoma. I have a V6 but now it sounds like a Baby V8. Highly recommend."

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About Mark C.
Vehicle
2001 Toyota Tacoma
I use my vehicle for
work
 
Truly American THUNDER!

Posted on 06/23/2006 by Samuel V. - 2000 Ford Expedition (Ocean Pines,MD)

1 of 1 people found the following review helpful.

"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.
Vehicle
2000 Ford Expedition
I use my vehicle for
Pleasure Cruz@the beach
 
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 2 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.
I use my vehicle for
getting around
 
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.
I use my vehicle for
everthing
 
Flow and Go

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

2 of 2 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)

2 of 2 people found the following review helpful.

"It is worth every penny"

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About Steve S.
I use my vehicle for
Everything
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