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Flowmaster Super Flow 44 Series Offset/Offset Oval Muffler - 2.5 in. (79-04 All, Excluding 99-04 Cobra)

Market Price $101.99 You Save 13% ($13.41)
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$88.58 (each)

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  • Item 18400
  • MPN# 942548

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    Features & Details

    • Signature Flowmaster Sound
    • Two Chamber "Gen II" Delta Flow Technology
    • Offset Inlet and Outlet Design
    • 2.5" Inlet/Outlet Diameter
    • Aluminized Steel Construction
    • Sold Individually
    That Flowmaster Sound. Improve your Mustangs exhaust flow for an increase in horsepower and a deeper throatier exhaust note with a set of Flowmaster Super Flow 44 Series Mufflers for a truly classic muscle car sound.

    Superior Design. The Flowmaster Super 44 Mufflers are MIG welded from durable 16 gauge aluminized steel for durability and value. The 44 series mufflers use Flowmasters patented two chamber "Gen II" 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 Super 44 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. Excludes 1999-2004 SVT Cobra.

    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

    What's in the Box
    • (1) Muffler
    Installation Info
    Tech Specs
    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
    Will it fit my Mustang?
    • Bullitt - 01
    • Cobra - 93, 94, 95, 96, 97, 98
    • Cobra R - 95
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 79, 80, 81, 82, 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

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    22 Questions / 14 Answers

    Ask a Question

    yes or no for a Flowmaster muffler on a v6 i just bought a 2002 mustang v6 and i want it to sound louder then it is now , i took the car to a muffler shop and the guy said he wouldnt suggest it because it would sound weird on a v6 , is there any other product or suggestions any one has ? please and thank you


    • that what i install on my 2000 v6 and it give a very hot sound my friend who got a 2010 v8 said its almost the same thing so for the price it very good.


    Show 4 more answers Helpful (29)

    Is an X-Pipe necessary? I want to improve the sound of my GT. In a perfect world I would get both a Xpipe and new mufflers but I cant afford both of them at the same time. I know an Xpipe would really help the sound and airflow but do I need to buy the Xpipe first? Could I not just get these mufflers welded in at the local shop with my stock catted h pipe? And lastly would the interior drone be any worse if I didn't have the Xpipe. I want better sound on the exterior and NO DRONE. Thanks


    • I would recommend having the stock mufflers cut out , and weld the new 44 mufflers in , if your on a budget .. Once u have thats done see how u like the sound from there , u will get a deeper tone from the 44 mufflers very low drone .. If u want more of an aggressive deep tone I recommend an H pipe, if u want a higher pitch racey sound then the X pipe will do the job :-)


    Show 4 more answers Helpful (8)

    Will these mufflers pass a smog in california?


    • While mufflers do not generally affect smog inspection, the Flowmaster Super Flow 44 Series Muffler does not have a CARB number and may not pass an emissions check in California.


    Helpful (1)

    08’ mustang V6 4.0 L, will it work and will it affect power and gas?


    • It is designed to be a direct fit for all 79-04 models excluding the 99-04 Cobras. It will not work on a 08. This muffler will alter a vehicle's exhaust tone and volume. It will have no tangible effect on MPG and will give you a subtle increase in power.


    Helpful (0)

    I measured the Length of the stick mufflers and the supper 44’s, will I have to buy extra piping? The 44s are a little shorter than the stock mufflers, from my measurements at least.


    • When installing the Flowmaster Super Flow 44 Series Offset/Offset Oval Mufflers with a stock exhaust, there will be a 0.25" difference in tubing diameter as 87-04 Mustangs utilize 2.25" exhaust from the factory. this will necessitate adapters to step up/down for the mufflers, which will take up the difference in muffler length.

      Rob D

    Helpful (0)

    Would this fit on 2016 V6 mustang? If not what other product would be similar that could be recommended?


    • The Flowmaster Super Flow 44 Series Muffler will not fit on a 2016 V6 Mustang. Unfortunately, we do not carry individual mufflers for the 15-17 Mustangs.


    Helpful (0)

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    Customer Reviews (100+) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.266667 4.3
    • Exhaust Note 4.674157 4.7
    • Fit & Finish 4.655556 4.7
    • Bang For Your Buck 4.611111 4.6

    • 5/5

      July 23, 2010

      single v6 muffler

      ok i installed this super 44 muffler along with a bbk cai and the sound is instant. at about 2k is when it gets more agressive and for a single exhaust this is the cheapest and best sound. overall a great product and would reccomend it.


      Helpful (23)

    • 5/5

      August 16, 2009

      perfect rumble

      These sound great! Nice and loud through the first 3 gears then they quite down around 4rth and 5th gear for highway cruising. Also have an awesome rumble at idle!


      Helpful (19)

    • 5/5

      September 22, 2010


      I bought these mufflers for my '04 Gt. I was almost dissepointed right after the install because they just didn't sound to good.. but I knew they needed to be broken in. over the course of about 3 weeks(420 miles), they finally broke in. Now they sound absolutely AMAZING! Thanks AM!


      Year: 2004 Submodel: GT

      Helpful (18)

    • 5/5

      May 22, 2010


      Awesome muffler that adds great sound & power. If your 'stang is bone-stock like mine was then this is the perfect item to start with to give it the muscle it deserves.

      Bryan Carduff

      Helpful (17)

    • 5/5

      November 30, 2010

      Amazing sound

      I put these along with a jegs off road h pipe and a CAI on my 97GT and it sounds so awesome. Loud and quality. It may be a little biased, but I think I have the meanest sounding mustang around. Everytime I start it up I just smile.


      Year: 1997 Submodel: GT

      Helpful (16)

    • 5/5

      June 10, 2010


      i had the 40,s on my 2000 GT and they were great but they r not half as good as 44,s best sound EZ to install and verry cheep love it.....................sounds best with the x pype


      Year: 2000 Submodel: GT

      Helpful (16)

    • 5/5

      May 29, 2010


      always thought flowmasters were quiet. but no way i get compliments all the time. recommend these big time and an o/r h pipe really sets them off!!

      Jeremy Eckert

      Helpful (12)

    • 5/5

      August 02, 2010


      theres nothing like the sound of a flowmaster and thease 44s r the best ive found yet. when i first put them on i thaught there they soundedd great but but just not quite enugh ring to them i drove it for about a week and a half and one day they finly broke in and woke up the sound was then perfict i still go out on a random drive just to hear the sound. and my bassani o/rX realy helps as well. american mucle is the greatest place posible to buy aftermarket mustang parts love it.


      Helpful (11)

    • 5/5

      October 19, 2010

      Recommended for any Mustang GT or V6

      Took these mufflers to my local exhaust shop and had them put these on with an h-pipe. I'm not going to say that it made my v6 sound like a Gt but it's pretty dang close. I'm very impressed with the sound and quality of the product. If you want the muscle sound your mustang deserves definitely pick the mufflers up.


      Helpful (10)

    • 5/5

      June 25, 2010

      '04 Mustang with Set of 44's

      I had a chance to get a pair of these installed on my Mustang and they sound great. I especially love the sound at around 2K RPM's just like Noel said. Sounds very aggressive and the price was right with these mufflers. I also have a JLT Cold Air Intake which adds a little more cackle to the exhaust when you let off which makes it that much more enjoyable to drive.


      Year: 2004

      Helpful (9)

    • 5/5

      June 13, 2010

      signature FM rumble

      these mufflers are really great! I got them welded on by a local muffler shop, because I don't have a welder. The difference is instantly noticeable. Like others have said, around 2K RPM's is where you hear the best aggressive sound. At idle a deep rumble. I highly recommend these 44's to anyone wanting to improve the sound of their GT.

      noel r.

      Helpful (9)

    • 5/5

      May 27, 2011

      Great Sound on V6

      What a great buy. An affordable way to make your 'stang sound more aggressive. Hear it on acceleration, present during driving, and can really hear it when you rev the engine. I took my car to a local shop so they could remove the old muffler and weld/clamp on the new one. Cost me about $97 but a lot cheaper than buying the tools/knowledge needed.


      Year: 2000 Submodel: V6

      Helpful (6)

    • 5/5

      March 20, 2011

      I love these mufflers

      I ordered two of these mufflers from AM about three weeks ago. At first the sound was ok, then I went on a 200 mile drive on spring break. When I got home from the trip, the sound had conpletely changed. It went from "ok" to amazing. The sound literally gets better every day and everyone loves how it bubbles when you accelerate and let off the gas. I am very happy I bought these!!! Best muffler for weld-in's period.

      Trevor S.

      Year: 2002 Submodel: GT

      Helpful (6)

    • 5/5

      August 12, 2010

      Super 44 Catback

      I had a custom 2 1/2" catback with 3 1/2" tips using Super 44s. It is on an 02 GT. It sounds and performs amazingly. No drone whatsoever with this setup. I can even have a normal conversation at 80mph with a convertible.

      Deceptive GT

      Year: 2002 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      December 08, 2012

      Turning Some Heads

      First of all let me tell you i have a V6, this is my first add on, and i was a little skeptical about the sound, But let me tell you I am in love with my car all over again!!! I installed it THIS MORNING and have already got a countless number of compliments, and I even had a few people want to race! It is not obnoxious and actually sounds like a real muscle car!


      Year: 2002 Submodel: V6 Austin, TX, USA

      Helpful (5)

    • 4/5

      January 26, 2011

      muscle car sound

      I have an 03 GT, and the tubing size on the stock exhaust system is 2.25 inches. the inlet and outlet on these mufflers are 2.5 inches. the shop I brought the car to for installation, had to make some adaptors to fit the smaller tubing size. cost was higher than it originaly was and it took more time. but overall they fit on great with the adaptors and these mufflers sound great on a GT with the stock H pipe and stock headers. nice low rumble at idle, and really sounds good around 2k RPM and while cruising in 4th gear.


      Year: 2003 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 08, 2013

      Single exhaust 02 v6

      I would say I get a lot of looks and thumbs up. Even if it has a single exhaust it still sounds great. When the car is cold it's at it's loudest. I would buy one again. I don't think the neighbors like it in the morning. HAHAHAHA


      Year: 2002 Submodel: V6 Connecticut

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      February 04, 2016

      My V6 has never sounded so great!

      I was so worried, as a V6 owner with a single exhaust pipe, that this would sound like a rice burner. Not at all! It rumbles at idle and at a steady speed, but roars when you press down on the accelerator. I haven't been able to get that silly smile off my face since I had it installed! Not too loud, but loud enough to where you can still have fun with it without waking up all your neighbors and alerting that police officer down the street that you're coming.


      Year: 2002 Submodel: V6 Leawood, KS

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      August 14, 2012

      Perfect Sound!

      If you don't like that high pitch, raspy noise you get from some mufflers and resonators, these mufflers are perfect! they are not extremely loud but can easily be heard sitting idle in the driveway while your in your house. It's loud when you want it to be, but quiets down for cruising speeds. Very happy wit hthis add on!


      Year: 2002 Submodel: GT Indiana

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 23, 2017

      I'm impressed!

      I've owned several 99-04 Mustang GT's and I've always put flowmaster mufflers on them. In the past I went with the super 40s. Most recently I went with the super 44s and they are by far better sounding in my opinion. These mufflers make the super 40s seem tame. If you own a 99-04 Mustang GT these mufflers are the one for you. No need to even bother with an off road x or h pipe, they sound awesome with stock h pipe and cats.


      Year: 2001 Submodel: GT

      Helpful (2)

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