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

   (38)
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2009 F150 with a Rumble

Posted on 09/13/2009 by Mark M. - 2009 Ford F-150 (Ada,OK)

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Price/Value
Quality

"Had my Flowmaster 40 Series Delta Flow installed at a local muffler shop and what a difference!! I used my stock exhaust pipe and reconnected the stock tailpipe as well and am not diappointed. It took just a bit to get used to the markedly increase exhaust note but it sounds great! Very deep tone with just a slight amount of interior resonance around 2000rpm."

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About Mark M.
Vehicle
2009 Ford F-150
I use my vehicle for
Family and light towing/hauling
 
2005 Ram, Quad Cab, 4x4, Hemi

Posted on 08/10/2009 by David C. - 2005 Dodge Ram (Conifer,CO)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I recieved the muffler in short order and had a local shop weld it into place. The Flowmaster is only about half the length of the original stock muffler, which is the size of a Smartcar....lol. I have not noticed any increases in power or economy, but the sound is the real reason for getting one of these. I originally took the resonator off when the Flowmaster was installed, but this created a loud drone in the cab between 1400 and 2000 rpm. The sound was awesome, but I had to re-install the resonator to quiet the cab down. The tone is still awesome though. All in all, very happy with this product."

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About David C.
Vehicle
2005 Dodge Ram
 
40 Series Delta Flow - a great compromise

Posted on 04/24/2009 by Brayton G. - 2003 Chevy Corvette (Walton,NY)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Just what you said. Good exterior sound, less cabin noise. I'm happy."

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About Brayton G.
Vehicle
2003 Chevy Corvette
I use my vehicle for
Fun
 
2005 GMC SIERRA 1500 SLT

Posted on 09/16/2008 by Pawel S. - 2005 GMC Sierra (Fort Walton Beach,FL)

4 of 9 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I love it . That`s what I wanted !!!"

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About Pawel S.
Vehicle
2005 GMC Sierra
 
new truck

Posted on 08/14/2008 by Schon W. - 2005 Ford F-150 (Olympia,WA)

4 of 8 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"had straight pipes and was to much for me this was a good sound with out to much"

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About Schon W.
Vehicle
2005 Ford F-150
I use my vehicle for
everyday use
 
Flowmaster 40 series

Posted on 08/12/2008 by John L. - 1996 Mitsubishi 3000GT (Sheboygan,WI)

4 of 6 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Sounded great! Very easy to install and worked great with a dual tip set up. Made my car sound more aggressive and noticeable. Caught a lot of people's attention on the road."

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About John L.
Vehicle
1996 Mitsubishi 3000GT
I use my vehicle for
Show car and auto-x
 
Flowmaster 40 delta flow review

Posted on 08/08/2008 by Mickey D. - 2001 Dodge Durango (Simi Valley,CA)

3 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I really enjoy my new muffler. The sound is awesome, nice deep tone :). makes my 2001 dodge durango look and sound tuff. only thing that bothers me is that they didnt have the muffler in stainless steel but in aluminum, its not that big of a problem though because flowmaster change their warranty to 10 years. but other wise really great product would recommend to anyone."

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About Mickey D.
Vehicle
2001 Dodge Durango
 
Great Sound

Posted on 07/25/2008 by John A. - 2005 Subaru Impreza (Delta,CO)

3 of 4 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I put this muffler on my subaru impreza outback sport and man does it sound mean. I went out on a limb when I bought it because I had not found any videos or recordings of flowmaster mufflers on subarus but the sound i got is very satisfying."

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About John A.
Vehicle
2005 Subaru Impreza
I use my vehicle for
Commuting, etc...
 
Flowmaster 40 Series

Posted on 05/23/2008 by John M. - 2007 Ford Mustang (Las Vegas,NV)

10 of 10 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I've had the Flow 40 Delta on my 2007, v6 Mustang for a few weeks now and they sound amazing. They are loud enough on the outside and resonate just enough on the inside to be fun and not give me a headache. I even drove from Las Vegas to Denver without any problems or annoyances. If you are looking for a great muffler with very good sound, go with this one. I searched for months before I settled on the Flow 40's and I couldn't be happier. Also cheap instal and I had a chrome tip welded on that really completes the look."

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About John M.
Vehicle
2007 Ford Mustang
 
Great Flow

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

4 of 4 people found the following review helpful.

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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 S10 Pickup
I use my vehicle for
everyday
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