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Flowmaster Delta Flow 40 Series Offset Muffler (79-04 All)

AmericanMuscle no longer carries the Flowmaster Delta Flow 40 Series Offset Muffler (79-04 All). Please check out Mustang Mufflers and Resonators for an updated selection.
12 Reviews
Our Price

$94.44

  • Item #18402
  • Market Price $104.99
  • You Save 10% ($10.55)
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AmericanMuscle no longer carries the Flowmaster Delta Flow 40 Series Offset Muffler (79-04 All). Please check out Mustang Mufflers and Resonators for an updated selection.

Customer Photos
Features
  • Signature Flowmaster Sound
  • Two Chamber Delta Flow Technology
  • Offset inlet and outlet design
  • 2.5" inlet/outlet diameter
  • Aluminized Steel Construction
  • Sold Individually
Description
That Flowmaster Sound. Improve your Mustangs exhaust flow for an increase in horsepower and a deeper throatier exhaust note with a set of Flowmaster Delta Flow 40 Series Mufflers for a truly classic muscle car sound.

Superior Design. The Flowmaster Delta Flow 40 Series Mufflers are MIG welded from durable 16 gauge aluminized steel for durability and value. The 40 series mufflers use Flowmasters patented two chamber delta flow design to increase power and sound. And each muffler is embossed with the "Flowmaster" name so you know it is the real article.

Application. The 40 Series Delta Flow Muffler's outer case measures 4" x 9.75" x 13", and features a 2.5" diameter inlet and outlet in an offset configuration. This is the perfect muffler for the 1979 to 2004 Mustangs.


40 Series Delta Flow


versus


40 Series Original


versus


Super Flow 44 Series
  • Minimizes interior resonance
  • Aggressive exterior tone
  • Two Chambered Muffler
  • Made of Aluminized Steel
  • No minimization of interior resonance
  • Aggressive tone inside and out
  • Two Chambered Muffler
  • Made of Aluminized Steel
  • Delta Flow technology minimizes interior resonance
  • Aggressive deep powerful tone
  • Two Chambered Muffler
  • Made of Black Aluminized Steel

Mustang Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

Most Helpful Reviews Read All Reviews

Overall Rating 4.8/5 Write a Review
4/5
nice

nice great sound,felt a little differense in horsepower,but over great product for beginers

Helpful (7) (0)

5/5
Great Sound!

Before I bought these mufflers my mustang was straight piped with no cats and 2.5" cat-back pipe. My fiance kept telling me its way too loud and that I NEEDED to fix it. I ordered these mufflers because

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Helpful (6) (0)

Customer Photos (6) View All Customer Photos

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Reviews (12) Write a Review

  • 5 Stars .83 83%
  • 4 Stars .17 17%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.8

out of 5 stars

12 Customers Recommend this Product

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  • 4/5 Yes, I recommend this product

    May 28, 2010

    nice

    nice great sound,felt a little differense in horsepower,but over great product for beginers

    dario

    Helpful (7) (0)

  • 5/5 Yes, I recommend this product

    February 24, 2010

    Great Sound!

    Before I bought these mufflers my mustang was straight piped with no cats and 2.5" cat-back pipe. My fiance kept telling me its way too loud and that I NEEDED to fix it. I ordered these mufflers because I love the great muscle car sound the flowmasters put out. Needless to say I wasnt dissapointed at all! I installed these mufflers and WOW what a difference...now the car sounds mean but isnt annoyingly loud. I think the setup of an offroad H pipe and these mufflers makes it sound like a early model mustang.

    Hunter P.

    Helpful (6) (0)

  • 5/5 Yes, I recommend this product

    March 03, 2010

    Best There Is

    The mufflers was the best thing i could've put in my mustang, definately makes a difference, it makes your stang sound great! Everybody looks when they hear it, its a must have item, shipping was very fast!

    Danny

    Helpful (5) (1)

  • 5/5 Yes, I recommend this product

    January 23, 2011

    Way better than stock.

    I'd been looking for a muffler for my 02 V6 Auto, something that is a little louder than stock. I bought two of this 'coz I miss having 2 tailpipes hanging in the back bumper. I have the divorced dual setup (no x,h,y midpipe) and the sound is exactly what I was looking for, louder than stock but not loud enough to be annoying and you can still carry a conversation while driving or on the phone, little to no drone at all. I like the mellow rumble when idling/driving and I feel a little more power when you stomped the gas pedal and the sound gets aggressive on higher RPM. If you seek attention while driving, don't get this 'coz it's not loud enough to be heard from a mile away. All in all I'm satisfied with the result.

    Ali R.

    Year: 2002 Model: V6 Driving Style: Daily Driver

    Helpful (1) (0)

  • 5/5 Yes, I recommend this product

    November 12, 2009

    Sound Nice!

    Put these on, large improvement over stock!, Sounds good with my BBK catted x pipe, I assume the delta flows are not as loud as the regular 40's. because they cut back on cab drone. I could be wrong. but to me they are still very loud and a large improvement over stock, Not very raspy or rattling like some others peoples I have heard at high RPMS (when using an x pipe) Overall very nice

    Ryan

    Helpful (1) (0)

  • 5/5 Yes, I recommend this product

    February 17, 2011

    delta flow 40s

    thanks american muscle for the great product. these mufflers sound great on my 97gt. they aren't too loud and they sound so smooth

    ruben

    Year: 1997 Model: GT Driving Style: Daily Driver

    Helpful (0) (0)

  • 5/5 Yes, I recommend this product

    December 06, 2010

    Great Sound!

    I bought these for my 1996 gt and they sound excellent, they don't idle too loud but when you get on the throttle it really turns heads, I've had them on for a few months now and they are starting to sound even better, I would defiantly recommend these to anyone who really wants to make their car growl. Sound amazing with the V8.

    Dan

    Year: 1996 Model: GT Driving Style: Daily Driver

    Helpful (0) (0)

  • 5/5 Yes, I recommend this product

    December 05, 2010

    Flowmasters 40 series delta

    Great quality and fast shipping. The flowmasters 40 series delta flow sounds good. Loud enough and quiet enough to hear the radio and have a conversation.

    Jeron

    Driving Style: Daily Driver

    Helpful (0) (0)

  • 5/5 Yes, I recommend this product

    August 27, 2010

    40 series

    idles pretty quiet so it doesn't rattle your brain. sounds good when you get on it and it's a very good prioe. definitely worth it

    CCbeastv6

    Driving Style: Daily Driver

    Helpful (0) (0)

  • 5/5 Yes, I recommend this product

    December 26, 2009

    Good sound

    I got this muffler as a Christmas gift, the person buying the gift for me didn't know I had a Original 40 on my Mustang already, so I went ahead and put the Delta Flow along with the Original 40 in a dual exhaust set-up. I couldn't have been happier with the result, at idle I get the nice deep rumble of the Delta Flow and at take off and cruising the loudness of both of the mufflers shine. But one downside is the Cabin drone, although it is standable.

    Dalton

    Helpful (0) (0)

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