Flowmaster Mufflers 40 Series American Thunder

View larger image
Internal Cut Away View of Flowmaster 40 Series Muffler - Product May Vary
Additional Views
List Price:
AutoAnything:
Shipping: Free Shipping
Availability:
Financing:
Bill Me Later - Buy Fast. Feel Secure. Pay Later!
Customer Rating: Customer Rating
         

Center Inlet / Dual Outlet
In Stock - Ships between 05/15/2008 - 05/16/2008

Offset Inlet / Center Outlet
Select options to see availability.

Offset Inlet / Offset Outlet
Select options to see availability.
Product InfoManufacturer InfoReturn Information

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

  (24)
Appearance Appearance
Ease of Installation Ease of Installation
Price/Value Price/Value
Quality Quality
Sort By
flowmaster mufflers

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

0 of 1 people found the following review helpful.

Appearance
Ease of Installation
Price/Value
Quality

"excellent product and fast shipping."

Was this review helpful? Yes No

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

Posted on 04/26/2008 by Aaron H. - 1988 Ford F-150 (Spring Creek,NV)

1 of 2 people found the following review helpful.

Appearance
Ease of Installation
Price/Value
Quality

"It has increases horsepower and throttle response. I hollowed out my catalytic converters first though. The flowmaster has a great sound to it."

Was this review helpful? Yes No

About Aaron H.
Vehicle
1988 Ford F-150
I use my vehicle for
ALL THE ABOVE
 
awsome

Posted on 04/23/2008 by Travis D. - 1996 Chevy Truck S10 (Waskish,MN)

3 of 3 people found the following review helpful.

Appearance
Ease of Installation
Price/Value
Quality

"i instaled the muffler in about 30 min. has good sound and gave me a noticable increase power. also gave me about 2 mpg better gas milage. will buy again for next truck."

Was this review helpful? Yes No

About Travis D.
Vehicle
1996 Chevy Truck S10
I use my vehicle for
things that 2 wheel drive tucks shouldnt do
 
Bettewr sound than stock and better mpg

Posted on 03/14/2008 by Amey K. (Midland,GA)

6 of 6 people found the following review helpful.

Appearance
Ease of Installation
Price/Value
Quality

"I found that the flowmaster provided a nice rumble during low rpm's and was quite during highway speeds. After the initial reving and constant lead foot to hear the exhaust, when driven under the same conditions as stock muffer, will, on average, yield more mpg."

Was this review helpful? Yes No

About Amey K.
I use my vehicle for
 
Flowmaster 40 American Thunder

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

6 of 6 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."

Was this review helpful? Yes No

About Monty Y.
 
THE SOUND

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

5 of 5 people found the following review helpful.

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

Was this review helpful? Yes No

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

Posted on 08/22/2007 by Richard L. (Kewaunee,WI)

6 of 6 people found the following review helpful.

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

Was this review helpful? Yes No

About Richard L.
 
One word: badass!!

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

11 of 11 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!"

Was this review helpful? Yes No

About Dan D.
 
SOUND PERFESTION

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

5 of 5 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"

Was this review helpful? Yes No

About Mike B.
 
Awesome Sound

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

6 of 6 people found the following review helpful.

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

Was this review helpful? Yes No

About Antonio O.
Vehicle
1999 Ford F150
I use my vehicle for
Pleasure
View all customer reviews for this product