Flowmaster Mufflers 40 Series American Thunder

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Center Inlet / Dual Outlet
Ships by 11/23/2009

Offset Inlet / Center Outlet
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Offset Inlet / Offset Outlet
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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

   (47)
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very pleased

Posted on 08/28/2009 by George O. - 2007 Dodge Ram (Yuma,AZ)

1 of 1 people found the following review helpful.

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Price/Value
Quality

"paid meineke for installation. muffler is great improved HP and Mileage and sounds great."

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About George O.
Vehicle
2007 Dodge Ram
I use my vehicle for
all purpose
 
Better performance, but pretty quiet

Posted on 06/10/2009 by Ryan N. (Spanaway,WA)

2 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I can definitely feel a difference in the acceleration, but for my engine it is pretty quiet. I was hoping for it to be a little more throaty. I have a 302 engine, and it has a big cat converter, so there isn't much push. I would recommend it for big blocks."

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About Ryan N.
Vehicle
1990 Chevy Corsica
Vehicle
1990 Ford F-250
I use my vehicle for
everything
 
99 durango 5.9l 360

Posted on 04/11/2009 by Dawn M. - 1999 Dodge Durango (Kenosha,WI)

7 of 10 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"this muffler sounds great on the truck. i like the sound better if i dont connect the tailpipe to the muffler. but ive got to so its not toooo loud. it has a nice rumble when yhou are full throttle and let off the gas. i love that. very great sound over all. if you do get this muffler try to find a way to mount it as far back as you can in the exhuast system. better sound IMO."

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About Dawn M.
Vehicle
1999 Dodge Durango
I use my vehicle for
daily driving
 
Brings back the days of old

Posted on 03/23/2009 by Charles P. - 1980 Chevy Van (Bronx,NY)

4 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"My current project of restoring a 1980 Chevy Van has been an enjoyable experience. Now with all of the mechanical restoration complete. I wanted to give the van a real feel of the type of exhaust system a small block chevy should have. The custom ordered exhaust along with the classic "Flowmaster 40" Mufflers completed this task. Wow what an improvement in overall output performance as well as that classic "Street Rod" sound."

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About Charles P.
Vehicle
1980 Chevy Van
I use my vehicle for
Personal Recreation
 
1998 Durango

Posted on 03/10/2009 by Nicholas O. - 1998 Dodge Durango (South Portland,ME)

6 of 6 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Installed it on my 1998 durango 5.2L and it brought it to life. Nice deep tone. Love it. Works great, ecpecially cause exhaust is already 2.5in."

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About Nicholas O.
Vehicle
1998 Dodge Durango
 
2007 chevy avalanche 3 INCHES IN AND DUAL 2.5 INCHES OUT.

Posted on 02/07/2009 by Christopher P. - 2007 Chevy Avalanche (Spring Hill,FL)

2 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I HAD MY 40 SERIES WELD ON AT A LOCAL MECHANICS SHOP, BUT INSTALATION WAS STRAIGHT FOWARD. I LIKE THE SOUND, BUT I THOUGHT IT WOULD BE LOUDER THAN IT WAS. NEXT FLOWMASTER WILL HAVE TO BE A RACE 40 SERIES. I DIDNT NOTICE ANY PERFORMANCE DIFFERENCE EITHER, DONT KNOW IF I WAS SUPPOSE TO THOUGH. OVER ALL WORTH THE 80 BUCKS I SPENT."

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About Christopher P.
Vehicle
2007 Chevy Avalanche
I use my vehicle for
FAMILY VACATIONS AND ACTIVITIES
 
THE BEST SOUND FOR MUSTANGS

Posted on 01/20/2009 by Christopher K. - 1989 Ford Mustang (Scranton,PA)

7 of 7 people found the following review helpful.

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Price/Value
Quality

"These are the best sounding mufflers for a mustang. I switched from Warlocks, and i cant believe how much better they sound....A+ Rating"

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About Christopher K.
Vehicle
1989 Ford Mustang
I use my vehicle for
Pleasure Summer Driving
 
Great muffler!

Posted on 01/09/2009 by Cody H. - 2000 Chevy Silverado (Buhl,ID)

9 of 9 people found the following review helpful.

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Price/Value
Quality

"Sounds great, boosts power, gained almost a mile per gallon. Well worth the money for the Flowmaster quality."

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About Cody H.
Vehicle
2000 Chevy Silverado
I use my vehicle for
travel, hunting, off roading, commuting.
 
Mean sound!

Posted on 12/30/2008 by Jackson B. (Merritt Island,FL)

5 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Just put this puppy in my '98 v6 3.0 Ranger and it sounds mean. Got the 2.5" pipes, gutted the cats and now people think i got a V8 under the hood. Not only sound, I can notice a more responsive throttle, and quicker acceleration. Great pipe, but the price on AutoAnything is not the best. Could of bought these pipes at a local Auto Zone for $72 with tax. Owell."

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About Jackson B.
I use my vehicle for
commuting, hunting, some off-road mudding
 
Flowmaster

Posted on 10/09/2008 by Zachary M. - 1994 Ford Ranger (Torrington,CT)

7 of 7 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I love my Flowmaster 40 Series American Thunder. I installed it on my Ford Ranger pick up truck and it sounds amazing. I love the deep sound and power gains from it. I initially had a factory muffler and the sound and restrictive baffling caused my motor to struggle. Thank you Flowmaster."

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About Zachary M.
Vehicle
1994 Ford Ranger
I use my vehicle for
Work and short distance trips around town and so forth
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