Flowmaster Mufflers 40 Series Delta Flow

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Center Inlet / Center Outlet
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Center Inlet / Dual Outlet
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Center Inlet / Offset Outlet
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Offset Inlet / Center Outlet
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Offset Inlet / Dual Outlet
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Offset Inlet / Opposite Side Offset Outlet
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Offset Inlet / Same Side Offset Outlet
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Features

  • The Flowmaster 40 Series Delta Flow Muffler boasts famous Flowmaster power and torque with a milder tone and reduced interior resonance
  • The ideal muffler for late-model performance cars and dual-exhaust cruisers
  • Quality Flowmaster muffler crafting uses aluminized steel for corrosion resistance and precise mig welds for maximum durability
  • The Flowmaster 40 Series Delta Flow Muffler utilizes Delta Flow deflector technology for noise reduction and superior exhaust scavenging
  • Original two-chamber design maximizes horsepower and torque
  • Casing embossed with the Flowmaster name
  • Your Flowmaster 40 Series Delta Flow Muffler carries a 3-year warranty

Description

All the power and performance of Flowmaster’s muscular mufflers without the roaring interior resonance—that’s the idea behind their 40 Series Delta Flow Muffler. It’s the ideal pick for late-model performance cars that want powerful exterior tone while enjoying a quieter ride.

At the heart of the 2-chamber design is Flowmaster’s exclusive Delta Flow technology. This innovative engineering utilizes precision-placed deflectors that not only mute interior sound, they fuel increased exhaust scavenging for the most possible power.

Also ideal for dual exhaust cruisers, the Flowmaster 40 Series Delta Flow Muffler 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 Delta Flow Muffler boasts a 3-year warranty.

Notes

  • Flowmaster 40 Series Delta Flow 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.
  • Select 40 Series Delta Flow model configurations are available with T-409 stainless steel construction instead of aluminized steel for extending protection against corrosion and yellowing.

Flowmaster Mufflers 40 Series Delta Flow Customer Reviews

Average Customer Rating

  (23)
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Great Flow

Posted on 04/27/2008 by Nick D. - 2003 Chevy Truck S10 (Murfreesboro,TN)

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Ease of Installation
Price/Value
Quality

"Great muffler for the price...sounds great and has that deep growl at idle too."

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About Nick D.
Vehicle
2003 Chevy Truck S10
I use my vehicle for
everyday
 
nice sound

Posted on 04/08/2008 by Todd ` S. (Kittanning,PA)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"this 40 series has a very nice external sound but does get loud on heavy throttle. interior resonance is a bit more than anticipated on pullout but very minimal at cruising speed."

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About Todd ` S.
 
Great mufflers

Posted on 03/14/2008 by Khaled A. (Sabah Alnaser,kuwait)

3 of 5 people found the following review helpful.

Appearance
Ease of Installation
Price/Value
Quality

"I was worried that after installing it on my 2004 crown vic it would create very high noise, but I got an amazing deep cool sound, %100 as what I wanted. it was also easy to install. I am glad I choosed the flowmaster 40 delta flow series. Khaled.A, Kuwait."

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About Khaled A.
I use my vehicle for
 
Great Build but Excessive Drone

Posted on 03/13/2008 by Ruben T. - 2007 Dodge Charger (Gilbert,AZ)

3 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I installed this muffler on a 2007 Dodge Charger. I had to replace it with a Magnaflow muffler instead due to the amount of drone it created."

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About Ruben T.
Vehicle
2007 Dodge Charger
I use my vehicle for
 
Best improvement for the money.

Posted on 01/10/2008 by Scott J. L. - 2006 GMC Sierra (Syracuse,NY)

4 of 5 people found the following review helpful.

"Ordered online and saved 50%versus local dealer.Had installed at shop for $60.00. Make sure you get muffler a quarter inch bigger than exhaust so as not to restrict the volumn.Great sound and noticed better all around perf.improvement.Very pleased."

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About Scott J. L.
Vehicle
2006 GMC Sierra
I use my vehicle for
Pleasure
 
very loud!

Posted on 10/23/2007 by Jeremy A. - 2002 Toyota Tundra (San Diego,CA)

2 of 6 people found the following review helpful.

"I installed this on my 2002 tundra 4.7l. this thing screams!"

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About Jeremy A.
Vehicle
2002 Toyota Tundra
I use my vehicle for
everything
 
Flowmaster 40 Series

Posted on 10/16/2007 by Matthew S. - 2000 Honda Accord (Akron,OH)

2 of 5 people found the following review helpful.

"I ordered two of these mufflers, and they are the best ones that I have come across, they sounds great, and I noticed a little better performance as well."

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About Matthew S.
Vehicle
2000 Honda Accord
I use my vehicle for
Everything
 
Flowmaster 40 Series Delta Flow

Posted on 09/19/2007 by Lisa K. - 1970 Ford F100 (Independence,KS)

7 of 8 people found the following review helpful.

"These mufflers sound great! They have a mean low growl that isnt to noticeable on the inside..but once you get outside it sounds meeaann!"

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About Lisa K.
Vehicle
1970 Ford F100
I use my vehicle for
commuting
 
My Bronco came alive!

Posted on 09/11/2007 by Scott W. (Ponca City,OK)

4 of 5 people found the following review helpful.

"When bolted on, I could hear and feel a difference over the stock single exhaust. The exhaust was upgraded to a dual system. They say "if you can make a motor breath better, it will perform better""

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About Scott W.
 
Flowmaster 40 series Delta Flow

Posted on 08/15/2007 by John Y. (Novi,MI)

3 of 6 people found the following review helpful.

"These mufflers sound good outside of the car. They give the car a nice growl. I have a 1968 Firebird with a 400 engine. A little more resonance inside of the car than I expected. I am running 2 1/2" exhaust."

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About John Y.
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