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Flowmaster Super 10 Series Offset/Offset Oval Muffler; 2.50-Inch (Universal Fitment)

Item 18432
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Market Price $92.15 You Save 12% ($10.60)
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$81.55 (each)

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Ship to: Ashburn - 20149
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Super Aggressive Sound
      • One Chamber Delta Flow Technology
      • Offset Inlet and Outlet Design
      • 2.5" Inlet/Outlet Diameter
      • 409s Stainless Steel Construction
      • Intended for Off-Road Race Use
      • Sold Individually
      • Universal Fitment; Modifications Will Be Required


      Super Aggressive Flowmaster Sound. Improve your Mustangs exhaust flow for an increase in horsepower and a deep aggressive exhaust note with a set of Flowmaster Super 10 Series Mufflers. These mufflers are so loud they are only recommended for off-road race use.

      Superior Design. The Flowmaster Super 10 Series Mufflers are MIG welded from durable 16 gauge 409s stainless steel for durability and value. The 10 series mufflers use Flowmasters one chamber delta flow design to increase power and sound. Each muffler is embossed with the "Flowmaster" name so you know it is the real article.

      Modifications Required. This Muffler was designed to be used on mutliple applications, as it is not a direct fit replacement part. In order to install this Muffler properly on your vehicle, some modifications to the exhaust system will be required.

      Application. The Super 10 Series Muffler's outer case measures 4" x 9.5" x 6.5", 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

      MPN# 842518

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (92)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 92 customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • April 03, 2020

        1 2003 Mach 1 - Ramon1113 Installation Time: Shop Install Installation Cost: 0-$100

        2003 Mach1

        Stock was louder, if you want something loud look for somtging else.

        Helpful (0)
      • March 22, 2020

        5 1998 GT - jaynmeg Installation Time: Less than 1 Hour

        Flow master Super 10

        Great product at a great price. Great sound nice and deep

        Helpful (0)
      • March 11, 2020

        5 2000 V6 - Automimc Installation Time: Full Day

        my super 10 experience.

        I was a little bit skeptical at first because they were aluminum aluminum doesn't last as long as still but when I finally got them put on the performance and everything was there and it was a lot lighter but at the same time they sounded great I highly recommend them to anyone

        Helpful (0)
      • October 13, 2019

        5 2003 GT - Terry Installation Time: Shop Install Installation Cost: 0-$100


        Sounds good and mean. Eventully ima get loudmouths though

        Helpful (1)
      • September 12, 2019

        5 2006 GT - cwilson67 Installation Time: Shop Install

        Super 10s

        Amazing sound! I’ve had these on all of my vehicles so far and can’t get over how great they are.

        Helpful (1)
      • August 03, 2019

        5 1995 GT - LegionIan Installation Time: Shop Install

        Great sound

        I originally bought SLP Loudmouth and I left a great review for them. If you want the loudest Mustang in town then that's what you want. If you want to actually be able to step on the gas pedal and sprint around town without worrying if there is a cop around the corner then get these.

        Helpful (0)
      • March 11, 2019

        4 1997 GT - sa Installation Time: Afternoon

        Nice Sound

        I had an american thunder axle-back ans swapped the mufflers out for these hoping for a louder and deeper sound. Overall I got a deeper rumble especially at idle, but not much more volume, I do have all four stock cats though. Went in and welded nicely, just a bit quiet for me.

        Helpful (0)
      • January 30, 2019

        5 1995 V6 - SergioV Installation Time: Afternoon

        The best

        Incredible agressive sound, feel good, betther performance

        Helpful (3)
      • January 27, 2019

        5 1996 GT - Earnest4426 Installation Time: Less than 1 Hour


        The loudest muffler flowmaster makes, definitely has that rumble that everyone loves. Couldn’t be happier with them!

        Helpful (5)
      • January 26, 2019

        3 2004 GT - SamR Installation Time: Shop Install Installation Cost: 0-$100

        limited sound

        Disappointed in sound level. Had flowmaster 40. Could not tell difference.

        Helpful (5)

      Questions & Answers (30 answers)

      5 Top Rated Questions

      is this a direct replacement muffler? I would like to know if this is a direct replacement muffler or will there have to be some modification in order for it to fit. I have a 2000 V6 and I am looking for something with a "deep" tone and not a "loud" one.

      • Some slight modifications will be needed to install these mufflers due to the difference in length over the stock mufflers. I am sure the results you are looking for will be surpassed with these great set of mufflers.

      Helpful (6) Show 3 more answers

      With the flowmasters 10 series does it backfire when you let of the gas?

      • Back fire is not the correct word for it, but it does have the "popping" effect when it is dropping rpm.

      Helpful (2) Show 1 more answer

      is this the loudest flowmaster muffler?can i use this on the street?will i lose hp or gain hp?

      • These are the loudest chambered muffler Flowmaster sells. As the description states on the American Muscle site, they are intended for off-road use only, but as you and many of us know these are just disclaimers they must make. You can run straight pipes, as long as you think you can get by the police! ;-) These should give you a very aggressive sound, plus the better HP gain. Just be careful who is watching you when you hammer on that Mustang! Be sure to post up a sound bite after you install them.

      Helpful (1) Show 5 more answers

      will this fit on a 2017 v6

      • This offers a universal fitment, so this isn't designed for any particular application. Due to this, always expect at least some modification.

      Helpful (0)

      If I install this on my v6 04 mustang, will it still pass inspection?

      • That will honestly depend on your state and their vehicle laws. Best thing to do would be check with a local shop.

      Helpful (0)
      10 More Questions
      I own a 2001 Mustang V6 with a stock muffler/exhaust. Do I need to buy two of these or would one of these just work? 1 answer
      Will this work on my 2004 mustang gt with bbk x pipe and borla cat-back? And where will the 10 series go on my set up? Where the borla mufflers are at? 1 answer
      im getting one on a 2000 mustang v6 but i don't have duel exhaust and its also stock and im trying to avoid a motorcycle sound so im just wondering if it would actually sound good or not 1 answer
      what is the difference between this offset/offset super 10 muffler and the offset/center super 10 muffler? sound? hp? flow? 1 answer
      I may sound dumb, but are these street legal in California? 1 answer
      this is a dumb question... but would this damage a stock car?? have a 02 GT that is stock, with H pipe and would like to put these on. Would it harm the engine??? cats would still be on and so on, just wanting a bit more sound. If I put these on should I have the car tuned?? 1 answer
      I purchased the pypes street pro catback exhaust off yalls website and I am really interested in these mufflers. I am looking for a really loud head turning sound and I was wondering what I would have to do to put these mufflers on the pypes street pro catback exhaust and how loud would it be ? 1 answer
      I purchased the pypes street pro catback exhaust off talks website and I am really interested in these mufflers. I am looking for a really loud head turning sound and I was wondering what I would have to do to put these mufflers on the pypes street pro catback exhaust and how loud would it be ? 1 answer
      Will these give an '04 V6 a raspier or a deeper sound? 1 answer
      I have a 2003 V6 Mustang, will this make my car too loud for daily driving? I know it says it's not recommended for that, but my V6 is weak sounding already, so will it really be too loud even with a weaker engine? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Muffler

      Tech Specs

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