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Flowmaster Super 10 Series Offset/Offset Oval Muffler - 2.5 in. (Universal Fitment)

Market Price $90.99 You Save 12% ($11.11)
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$79.88 (each)

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  • Item 18432
  • MPN# 842518

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    Features & Details

    • 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 Details

    What's in the Box
    • (1) Muffler
    Installation Info
    Tech Specs
    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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    Questions & Answers (18)

    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

    I have a 03 V6 stang and I want that deep sound when driving but don't want them to be extremely loud when driving around as it is my daily. Should I get these or the Flowmaster 40 Series?

    • The Flowmaster Super 10 Series muffler will be a single chamber muffler, and will be very loud. We would recommend a two chamber Flowmaster 40 Series muffler to avoid being too loud.

    Helpful (0)

    Do the super 10 offset/offset oval muffler come in a

    • Unfortunately the Flowmaster Super 10 Series Offset/Offset Oval Muffler is only offered in the 2.5 Inch design.

    Helpful (0)
    Post Your Question
    10 More Questions
    I How have pypes violators wondering how these compare in tone, aggression and overall loudness 1 answer
    I have a Roush side exhaust setup right now with MagnaFlow mufflers. My question is will I be able to use thesearch mufflers because my current mufflers have the inlet and outlet on the same side. Thanks in advance 1 answer
    Can someone please link me to the 3 in. model? A rep showed me but I lost the link 1 answer
    I have slp loudmouth paired with high flow cats and a off road x pipe. Do you think the Flowmaster 10 series would be loader or equal? 1 answer
    How do these sound when paired with an offroads xpipe?? 2 answers
    I was wondering about something. I am about to order two of these flowmaster super 10 series mufflers with the BBK O/R x pipe. Will the exhaust from start to the tips look just like it does before in length, or will i need to buy some straight pipe or U-bends???? 1 answer
    I have a 2000 gt with original 40's on it. I want something louder but that isn't just noise. I love the tone and ive done extensive research on what mufflers to put on so now I want some advice. I do still have cats and the stock h pipe. like I said looking for something between what I have now and just noise, loud but with a tone. something that makes people look but aren't exactly annoyed. something that's somewhat noticeable at idle and will turn heads when the you open up the throttle. (I know I cant please everyone but you get the gist of what I mean.) also this is my daily driver but I'm not worried about exhaust drone. 1 answer
    This works well on a GT ? Please read details of my question. I checked out the Flowmaster official page and in the chart they have it says that Flowmaster 10 Series is no designed for 4.6 cyl engines, since I got a 99 GT Stang, You guys can check it out, why is that ? I dont know if I should buy the Super 10s (Ive seen it on YouTube on 99GTs and rock) or should I get the 40 Series ? I want something definitly louder than the stock mufflers, but NOT TOOOO MUCH, I just need something that can get some people to look at my Stang :D 1 answer
    Are these weld on or clamp on? I just removed my magnaflows because they did not sound that good and right now im just running catted mid pipe to dumps, but it was easy to remove because it had clamps on both sides, connecting to the mid pipe and connecting to the dump pieces. Will this muffler be able to do the same? 3 answers
    v8 sound i drive a v6 as an everyday driver and i really want that v8 sound will this give me the v8 sound that i desire 2 answers

    People Who Bought This Item Also Bought

    Customer Reviews (77) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.5 4.5
    • Exhaust Note 4.621622 4.6
    • Fit & Finish 4.837838 4.8
    • Bang For Your Buck 4.783784 4.8

    • 5/5

      Installation Time: Full Day

      May 24, 2018


      Love the sound of these mufflers. They have a nice aggressive tone and are not overly loud inside the car. Also, I went from the super 44's to these 10's and let my say, I am glad that I did.


      Year: 1998 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Afternoon

      May 16, 2018

      Smile on your face every time

      I bought these mufflers for my 88 mustang gt along with a set of 2.5 flowtubes. The install was simple because I use the turn down method and cut the old exhaust tips off for the turndowns. Also, I bought universal exhaust hangers to complete the install. Don’t second guess yourself. If you like aggressive, loud, in your face, hear me mufflers these are those!


      Year: 1988 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      February 26, 2018

      Super 10 very nice

      Noticeable difference in sound, straight piped with 2 super 10s equal loud


      Year: 1996 Submodel: V6

      Helpful (5)

    • 4/5

      Installation Time: Less than 1 Hour

      February 25, 2018

      It’s pretty good

      Well I originally had my mustang straight piped so it was really loud and read comments about how it made it deeper so I got it and got it on and it did make it deeper but made it really quiet compared to straight piped but it still is definitely louder and deeper than the original muffler that was first on it.


      Year: 2004 Submodel: V6

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      February 19, 2018

      sounds great!

      Purchased this product and she sounds amazing! Easy to install. It took me about an hour give or take. they are loud and have a nice muscle car tone to them! I would recommend these if you are trying to get heads to turn from a distance.Thanks American Muscle!


      Year: 1989 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      December 15, 2017

      Flowmaster Super 10

      Took a chance with Flowmaster for the first time and they actually sound great! My mustang sounds mean so I’m happy with my purchase


      Year: 1992 Submodel: LX

      Helpful (4)

    • 5/5

      November 17, 2017


      Exactly what I was looking for, with sound and fit


      Year: 1998 Submodel: V6

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      November 04, 2017

      Hounding difference

      I got my super 10s in a day after I ordered and I’m glad I did. I still have the stock H pipe tho but it’s a Huge difference when I’m taking off and letting it slow down by itself. I hear sooo much more backfire now since I put these on and I love it.


      Year: 2000 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      October 30, 2017

      10 series Flowmasters on my 94 mustang gt

      I love the way my car rumbles now, it's exactly how I wanted it to sound! Couldn't be any happier!


      Year: 1994 Submodel: GT

      Helpful (3)

    • 4/5

      Installation Time: Less than 1 Hour

      July 31, 2017

      Super 10s

      Installed on my notchback 5.0. Jus the sound I was looking for. Wasn't as loud as I expected and must say I'm glad because I know the super 44s wouldn't have done it for me. Very satisfied with the super 10 purchase.


      Year: 1988 Submodel: LX

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 14, 2017


      Loud raspy sound but also a low deep growl my car sounds better than it looks amazing product.


      Year: 1994 Submodel: GT

      Helpful (7)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      July 12, 2017

      Super 10 mufflers

      Not as loud as i thought they would be. I went from the Super 44s and honestly not a huge difference. When passing the 10s are louder but 44s can be heard from a further distance(twice as far as the 10s). Still have that classic flowmaster mellow sound and when you get on it they will definitely scream to whoever you pass up. Same tone at idle as the 44s though, but the 10s do seem to flow a bit better with a little better power gain. Happy with the 10s but expected more.


      Year: 1987 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      July 09, 2017

      Sick nasty

      Sweet sounds baby. That chords comin out of tht sucker as knarly duuuuddddeee


      Year: 2000 Submodel: V6

      Helpful (6)

    • 5/5

      May 30, 2017

      Worth the money

      Definitely worth the money. Very pleased with the sound of it.


      Year: 2002 Submodel: V6

      Helpful (5)

    • 1/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 21, 2017

      They made my GT quiet

      I had glass packs before i bought these....i regret ever even thinking flowmaster would come through...they made my car way too quiet and now i cant enjoy the sound of my car when i drive...because there is hardly any sound!!


      Year: 2002 Submodel: GT

      Helpful (8)

    • 5/5

      April 04, 2017


      Great sound even with stock piping and cat, a great price also


      Year: 1996 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      March 13, 2017

      Mustang Flowmaster Super 10

      Easy buy, nice buy, I feel as it was worth it and it sounds great at idle and when I'm gassing it down the street.


      Year: 2000 Submodel: GT

      Helpful (3)

    • 5/5

      February 24, 2017

      awesome sound!

      I went from have SLP loudmouth 1 to the super 10 series. and let me tell you what. They are one of the better sounding mufflers I've had. they are not as loud as the slp during idle but it has more of tone. When upstairs they are just as loud. Only way I can tell that is someone else driving. In the car it is no where near as loud either. I'm over all happy with the mufflers. Also great tone.


      Year: 2003 Submodel: GT

      Helpful (5)

    • 4/5

      February 10, 2017


      They sound great but with an O/R xpipe, they aren't as loud as I'd hope they would be. But the sound and tone makes up for it.


      Year: 2000 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      February 06, 2017

      Its the only Muffler thats not! a Muffler!

      This thing makes my 88 GT sound like the Beast of the streets, It is the sound everyone turns the head to see whats coming down the street... Including our friends in Blue. Flowmaster Super 10 is the true sound of Power!


      Year: 1988 Submodel: GT

      Helpful (4)

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