Flowmaster Mufflers 40 Series American Thunder

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Center Inlet / Dual Outlet
Ships between 01/08/2009 - 01/09/2009

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 strongest-sounding muffler
  • Quality Flowmaster muffler crafting uses aluminized steel for corrosion resistance and precise mig welds for strength and durability
  • The Flowmaster 40 Series is ideal for early muscle cars, off-road and race vehicles and dual-exhaust rides
  • Hear the strength 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 provides maximum horsepower and torque
  • The showpiece muffler for many Flowmaster American Thunder Exhaust Systems
  • Casing embossed with the famous Flowmaster name
  • Your Flowmaster 40 Series Muffler is backed by a 1-year warranty

Description

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

If the roaring sound of an engine is what you crave, you’ll love the Flowmaster 40 Series. Aggressive sound is maximized outside, while high-volume interior resonance responds to 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.

Perfect 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 is fully mig-welded for maximum durability and strength. Best yet, your Flowmaster 40 Series Muffler boasts a 1-year warranty.

Notes

  • Flowmaster 40 Series American Thunder Mufflers is available 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

  (39)
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Mean sound!

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

1 of 1 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)

2 of 2 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
 
wicked product

Posted on 10/04/2008 by Dylan S. - 2000 Toyota Tacoma (Aurora,CO)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Very loud and aggressive, especially if i hover around 2100 rpm. however very little cab noise (with windows up). it's got a head turning growl and i just love that start-up roar. very nice. very pleased. only thing is is that i had to weld the muffler in sideways a quite a bit because it didn't even come with the option for center inlet/outlet. settled for a offset/in and center/out. love it though."

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About Dylan S.
Vehicle
2000 Toyota Tacoma
 
08 GMC SIERRA

Posted on 08/15/2008 by Garret B. - 2008 GMC Sierra (Nottingham,MD)

2 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"This flowmaster opened up a little more hp and gave me that beautiful flowmaster sound at take off and on through the gears. The only down fall would be the "brown note" when just cruising at highway speeds in overdrive. If you are a daily driver of long distances you might want a little less cab noise. As far as install I kept the passenger side(stock) pipe and bent/fabricated a drivers pipe to match. It took me about 3 hours to bend, weld and hang."

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About Garret B.
Vehicle
2008 GMC Sierra
I use my vehicle for
work and ...
 
great product

Posted on 07/31/2008 by Brandon K. - 2006 Nissan Titan (Annapolis,MD)

2 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"great sound both inside and out. great muffler"

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About Brandon K.
Vehicle
2006 Nissan Titan
I use my vehicle for
everything
 
f 150

Posted on 07/24/2008 by Brady B. (Lewiston,MN)

2 of 2 people found the following review helpful.

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Price/Value
Quality

"it went on easily for me and the truck sounds nice the muffler gives the turck the rumble i wanted"

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About Brady B.
 
What a Sound!

Posted on 07/02/2008 by Rick M. - 1970 Plymouth Roadrunner (Centralia,WA)

2 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I installed the 40 Series with an X pipe on my 70 Roadrunner.It gives the term "American Muscle" a new meaning.What a sound.One of the best investments I made for my Roadrunner.You guys really came thru.Thanks,Rick"

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About Rick M.
Vehicle
1970 Plymouth Roadrunner
I use my vehicle for
Weekend drives,and car shows
 
First time buyer

Posted on 06/28/2008 by Joshua G. (New Haven,CT)

2 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I was a little nervous about getting the loudest one but its sounds awsome, even with a little 4 banger like mine. though i should have measured the exaust pipe before order. the welding job the guys at monroe did is adequate but could have been better."

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About Joshua G.
I use my vehicle for
everything
 
Excellent Exhaust

Posted on 06/26/2008 by William H. - 2003 Jeep Wrangler (Rosedale,IN)

5 of 5 people found the following review helpful.

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Price/Value
Quality

"Not only does the 40 Series sound good, but it also helped improve my gas mileage a little bit also. It also helped my Jeep run a little freer compared to the factory exhaust it replaced."

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About William H.
Vehicle
2003 Jeep Wrangler
I use my vehicle for
Every day driver
 
flowmaster mufflers

Posted on 05/07/2008 by Bob C. - 1955 Ford F-100 (Campbellsville,KY)

2 of 3 people found the following review helpful.

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Price/Value
Quality

"excellent product and fast shipping."

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About Bob C.
Vehicle
1955 Ford F-100
I use my vehicle for
car cruises & shows
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