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Pypes M-80 Bullet Style Muffler (79-04 All)

100+ Reviews
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  • Item #20108
  • MPN# MVR200S

  • Market Price $59.79
  • You Save 13% ($7.80)
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  • Aggressive Throaty M80 Tone
  • Straight-Through Design for Superior Flow
  • 4" Round Inline Design
  • 2.5" Inlet/Outlet Diameter
  • 304 Polished Stainless Steel Construction
  • Sold Individually
Aggressive M80 Sound. The M80 "Race Pro" muffler has a straight-through design that features a layer of stainless mesh around a unique internal 3.5" louvered tube, accompanied by a healthy stuffing of basalt insulation that results in an aggressive muscle car tone and an improved exhaust flow for more power.

Polished Stainless Steel Construction. Constructed from polished 304 Stainless Steel to resists rust and corrosion, the Pypes M80 Muffler features a round 4" diameter tubular bullet style casing that is welded closed to ensure a long life without any annoying rattles.

Application. The Pypes M80 Muffler's outer case measures 14" long and 4" round, it features a 2.5" diameter inlet and outlet in a straight inline configuration. Making this is the perfect muffler for the 1979 to 2004 Mustangs.

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
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

07 GT w/ m80's!

Had these mufflers installed on my 07 GT, i have a pypes o/r x pipe and had the m80s welded in the middle following a custom axle back muffler delete all the way out, (straight pipes) and dammmn! these ...

Read More
Helpful (16)

Do not buy!!

I bought these and boy do i regret it. There extremly loud and im not talkin about a good loud either. Really raspy almost sound like a truck with straight pipe. If you go past 2500 rpms you might as well ...

Read More
Helpful (18)

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

Customer Photos (26) View All Photos

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19 Questions / 11 Answers

Ask a Question

Would they still sound good just replacing my stock muffler and stock pipes? I'm just curious to know if anybody has replaced their stock muffler with the m-80 and if it was successful or not. I don't have an aftermarket muffler or pipes everything is stock since i just bought the mustang...

iSayWhtSheFeels Year: 2000 Model: V6

  • If you simply replace the muffler it will definitely get louder and a little performance gain because you're letting the engine "breathe" better, however if you want true sound and power out of your V6, the best thing you can do is dual exhaust it. Then you open your options a lot from there.

    Best Answer

    jonnyb8891 Year: 2007 Model: V6 Top 25 Contributor

    Good Answer (2) (0)

Show 1 more answer Question Resolved

Will these work with 1994 Mustang stock exhaust Hello, I have a 1994 Ford Mustang V6. I am hearing a lot about these mufflers, but that they only sound best with X-Pipes. If I have stock exhaust will these then sound bad or should I go for a different muffler? I did not want to get an obnoxious noise or popping because I did not have X-Pipes. Any clarity here? Thanks... :-)

devanslive Year: 1994 Model: V6

  • Any muffler is better than the stock ones. these should be fine and I don't here a big difference if any at all with the X-pipes.

    Lenin1 Year: 2012 Model: GT

    Good Answer (0) (0)

Show 3 more answers Question Resolved

How would these sound as just a weld in with everything else stock? Don't want anything overly loud.

MattymagsOrlando Year: 2002 Model: GT

  • I have stock headers, stock midpipe, and the pypes M80's on my 88 lx. You wont be disappointed once you get them installed. I didnt want anything overly loud as well, just a low grumble. They sound really clean and healthy and your mustang wont sound overly obnoxious.

    Best Answer

    rubender93 Year: 1988 Model: Other

    Good Answer (2) (0)

Show 4 more answers Question Resolved

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Customer Reviews (100+) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:0-$100

  • Loudness / Volume 4.495575 4.5
  • Exhaust Note 4.61062 4.6
  • Fit & Finish 4.619469 4.6
  • Bang For Your Buck 4.858407 4.9

  • 5/5

    May 04, 2011

    07 GT w/ m80's!

    Had these mufflers installed on my 07 GT, i have a pypes o/r x pipe and had the m80s welded in the middle following a custom axle back muffler delete all the way out, (straight pipes) and dammmn! these are loud! they sound mean! nice deep tone when idle, when you rev it up you will wake up the block! nice mufflers definately buy


    Year: 2007 Model: GT Driving Style: Daily Driver

    Helpful (16) (1)

  • 1/5

    Installation Time: Afternoon

    April 12, 2012

    Do not buy!!

    I bought these and boy do i regret it. There extremly loud and im not talkin about a good loud either. Really raspy almost sound like a truck with straight pipe. If you go past 2500 rpms you might as well turn the radio off. Sorry should of stuck with magnaflows but that's what you get for trying to save a buck.


    Year: 2002 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Houston, TX, USA

    Helpful (18) (3)

    • Response from AmericanMuscle

      This is the first I've heard someone disappointed with the sound these mufflers give off. I'd suggest coupling these with an O/R X-pipe as some others have commented that the two combined sounds great. If you'd like, please contact our Experts and they'd be more than willing to help you find the sound your looking for!

      Lisa , Customer Care

  • 5/5

    February 15, 2011

    Sounds Awsome!

    These mufflers really brought out the mean sound in my 2000 Mustang GT. Had an Off-road X pipe and the M-80's installed at a local exhaust shop and it turns heads everywhere i drive. I wasn't sure if I wanted to buy these or SLP Loudmouth, but the price caught my eye and was no doubt the right choice! Great Item, Thanks American Muscle.

    Mark S

    Year: 2000 Model: GT Driving Style: Daily Driver

    Helpful (8) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    August 17, 2012


    flowmasters sound good but weren't loud enough...these sound 1000 &1/2 times better than magna packs... they don't pop alot like borla , the sound is clean & amazing & they are not obnoxiously loud like slp...don't let the cheap price intimidate you..aslo 99% of you tube videos for these mufflers are don't sound anything like they sound in person


    Year: 1998 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Donaldsonville, LA 70346, USA

    Helpful (6) (0)

  • 5/5

    August 23, 2011

    Quiet in the neighborhood, mean on the street.

    Perfect fit with the Pypes "flow tubes" and some cheap auto part store turndown tips. A little weld to put on the hangers or some ingenuity with a pipe clamp and some wire and these will be the last exhaust you need. Racey growl with Pypes offroad X-pipe, no popping or obnoxious noises, makes a Mustang sound like a Mustang. If you like the 2 chamber drone these are NOT the muffler to buy, if you want Ferrari and lambos to take a second look at you these ARE the mufflers to buy. Happy Stangin'


    Year: 2004 Model: GT Driving Style: Show

    Helpful (10) (2)

  • 5/5

    February 19, 2011

    Just what i needed

    All i can say is these mufflers made my stang quite the head turner after i welded them on. The deep rumple of my coming down the road is something that any muscle car enthusiast would appreciate. Great product!!!!!


    Driving Style: Street / Strip

    Helpful (6) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    February 17, 2012

    WOW just WOW

    ok so i did a ton of research before i pulled the trigger on these, and it still never answered all of my questions so im gonna answer them here in case anyone else is on the fence. Yes they are cheaper than most setups, no it does not reflect the quality at all, they are pretty much built the same as the borla stingers. I had flowmaster 40 series cat back on my car before these, once i added my 4.10s the drone was crazy on the freeway so i started looking for a straight thru muffler, well these have no drone and are nice and mild at crusing speed. I also wanted loud but not annoying, after listening to some LM1s in person they were loud but realy high in the tone and didnt sound great on a o/r x pipe. These on the other hand have a really nice deep ton and wow do they wake up when you get on it, its was really suprising how great they sounded and i could tell a big difference in the low end torque thanks to them breathig way better than the flows. Bottom line they are not a big name that you can brag about, but once you hit it you wont need to brag they do all the talking for you, save you money and run these instead of the high priced name brands, they sound better are built just as good and wow your stang will be fun all over again.


    Year: 1999 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2

    Helpful (5) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    October 17, 2011

    My car sounds great now!

    Well, after noticing my mustang needed new mufflers (mine were all rusted out), I started searching for some good mufflers to install. I was looking at glasspacks, but wasn't sure were to start. I was looking at these and read all the 5 star reviews. So I decided to take the plunge and order a couple. Oh my god these are great! I haven't really made any performance upgrades to my mustang (but I want to now!) They have a great throaty sound. They're quiet enough for every day driving, but when you romp on the gas they get nice and loud. I went to go show a buddy of mine, and by the time I got to his house he was already standing in the driveway because he heard me a block away at the stop sign just romping on the gas a couple times. Im very happy with these mufflers and will shop on this site more often :-)


    Year: 1997 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Bismarck, ND

    Helpful (5) (0)

  • 5/5

    April 11, 2011

    pypes m80's in an 07 v6

    well ive had 3 different exhaust systems on my 07 v6 and now ive finally found one i liked, combined with the pypes x-pipe...highly recomened


    Year: 2007 Model: V6 Driving Style: Street / Strip

    Helpful (8) (2)

  • 5/5

    January 21, 2011

    Best sound in town

    Have owned Mustangs since 1965 including three Shelbys but my wife's 98 GT sounds better than any of them since we installed the Pypes. Two other guys in my shop ordered them once they heard mine

    Dan Barkhouser

    Year: 1998 Model: GT Driving Style: Daily Driver

    Helpful (5) (0)

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