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

Market Price $101.99 You Save 13% ($13.41)
Our Price

$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
  • 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
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

People Who Bought This Item Also Bought

Most Helpful Reviews


Amazing sound! One of the best things I have ever purchased for my car!

Helpful (2)

super 44s

i welded these on my 02 mustang wished i would have looked harder on the internet paid 96$ for these at my local advance auto parts store when i could have bought for only 80$ on american muscle they sound ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 100+ Reviews

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14 Questions / 13 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


Helpful (29)
  • 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

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


Helpful (8)
  • 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

My main confusion is what is the difference between the flowmaster 40's and the flowmaster 44's. I have a 99 gt and I want a deep growl, but I also want it to be a medium loudness. Any suggestion on which I should purchase?


Helpful (0)

My '92 gt v8 has no sound at all right now, if i install these will it give it a sound and make a difference With the stock exhaust?


Helpful (0)
  • If you are to install these mufflers, it will give your car a deeper and throatier exhaust sound over the stock sound that you currently have.


I have a 2004 3.8L v6 mustang. I have read that the stock exhaust size is 2.25", so will this 2.5" (or possibly a 3") muffler fit on the stock exhaust? I was also wondering if this will give any performance gain?


Helpful (0)
  • Being a 2.5" Muffler, the Flowmaster Super Flow 44 Series Offset Muffler would require a 2.25" to 2.5" adapter on both ends to connect to the stock exhaust on a GT or V6 Mustang.

    Rob D

Does anyone know if this muffler has better flow than a stock one on a 2002 mustang? Like can exhaust move more freely threw this one than a stock one


Helpful (0)
  • Yes, this Flowmaster will move your exhaust gasses a lot better than a stock muffler.


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Customer Reviews (100+) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.31579 4.3
  • Exhaust Note 4.773334 4.8
  • Fit & Finish 4.710526 4.7
  • Bang For Your Buck 4.631579 4.6

  • 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 (1)

  • 5/5

    Installation Time: Less than 1 Hour

    May 03, 2016

    Perfect amount of muscle!

    Bought these for my 02 GT and could not be happier. Wasn't quite in the budget for a full exhaust overhaul so I purchased these and wow I was impressed. My local shop cut these in on my stock piping for $130 and was only an hour of work.. sounds really good especially on the low end. On the highway is definitely noticeable but not too much drone at all. You won't be disappointed with this product at all.


    Year: 2002 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    April 29, 2016

    Sound Quality is Better

    I have an '86 Fox GT with a short ram intake and BBK shorty headers. When I installed the Super 44s by Flowmaster, the sound quality improved. As for the volume, it remained the same. The only difference is that I know have a mean rumble at low RPMs. I daily drive my Fox to school and I'm noticing a ton of people turn their head to see me pulling in and pulling out of campus. Overall, I'm satisfied with this product.


    Year: 1986 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    August 18, 2014

    Super 44's really are SUPER

    I have stock headers, H-pipe, cats. even with all that, the super 44 is a must buy. Had a buddy weld em in. Soon as they got on, turned the key, and could tell a major improvement over stock.Deep throaty rumble when cold, a little quieter once warm. Great volume as you accelerate. On the highways, its quiet, but you can tell its a tad louder than stock. However, accelerating from a stop, even a mild acceleration, you will hear the difference! Cruising back roads is alot more fun now, as is getting on the highways! In the parking lot at work, I've gotten heads to turn as I rev the engine. Basically its slightly louder than normal at idle, but its loud when you want it to be. High recommend!


    Year: 2001 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    September 29, 2013

    This is THE best muffler I've ever owned!!!

    I completely recommend this product 100% It has an amazing sound to it after you get them broke in (roughly about 300-500 miles max). This is definitely the muffler you want to buy!!!


    Year: 2002 Submodel: GT Murray, KY

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    August 28, 2013

    The iconic muffler for a Fox

    This replaced the 40 Series as what should be the classic Fox sound....nothing sounds like a 5.0 (347's) too than this muffler. Yes it drones but I have never minded it. If you dont like drone, DO NOT GET THIS MUFFLER


    Year: 1992 Submodel: Other Philly

    Helpful (1)

  • 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 (2)

  • 4/5

    Installation Time: Less than 1 Hour

    March 27, 2013

    Great Product

    Car sounds great at idle, has a nice rumble that's not to loud for the neighbors to complain. They sound better as you go threw the rpm range, right at 2000 is the best sound.


    Year: 1991 Submodel: Other Chandler, AZ

    Helpful (1)

  • 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 (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    December 07, 2012

    Flowmaster 44's ROCK!

    I had a pair of these installed by a local muffler shop for $45 where they cut off the stock mufflers and welded the new 44s in place. Soumd is awesome, especially with the new CAI and throttle body I installed. Around 2K rpm these babies really growl but they do not resonate like some mufflers so the sound is throaty but not super loud, unless you really get into it. Makes the stang sound so much better than the stock duals. Really glad I added these and the cost from AM was half what local shops were pricing the same 44's.


    Year: 1995 Submodel: GT Dallas, TX, USA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    January 27, 2012

    Let her sing!

    I put two of these bad boys on my 4.6L to replace the factory mufflers. WOW. Sounds great. I sometimes ride around town with my windows down and radio off just to listen to the old girl purr! I highly recommend purchasing a pair!


    Year: 2001 Submodel: GT Orlando, FL

    Helpful (1)

  • 5/5

    April 22, 2011


    Amazing sound! One of the best things I have ever purchased for my car!


    Year: 2000 Submodel: V6

    Helpful (2)

  • 5/5

    December 15, 2009

    03 Mustang GT

    The 44s along with the cold air intake kit gives my Mustang the sound that inspires me to get on the road and ride. Like a musician looking for that special tone. I found the tone I was looking for at a very affordable price.


    Year: 2003 Submodel: GT

    Helpful (1)

  • 5/5

    October 09, 2009

    super 44s

    i welded these on my 02 mustang wished i would have looked harder on the internet paid 96$ for these at my local advance auto parts store when i could have bought for only 80$ on american muscle they sound very good and nice when you romp on them, i would definately buy these if i were you. add the new sound on the road with some flowmaster 44s


    Year: 2002

    Helpful (1)

  • 5/5

    July 03, 2009


    These mufflers are a good example of what i think every mustang should sound like! I bought an 88 Gt and the super 44s came on it,but if they didn\'t I still would have bought them from AM! amazing sounding mufflers glad you guys have them now.


    Year: 1988 Submodel: GT

    Helpful (2)

  • 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 (5)

  • 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 (16)

  • 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

    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 (14)

  • 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 (18)

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