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Pypes Violator Cat-Back Exhaust (98-04 GT, Mach 1)

46 Reviews
Our Price


  • Item #20005
  • MPN# SFM27V

  • Market Price $466.99
  • You Save 10% ($47.00)
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Product Videos Customer Photos
  • Increases of 8 to 13 Horsepower
  • Aggressive Sound Profile
  • 2.5" 409 Stainless Steel Tubing
  • 3.5" Polished 304 Stainless Steel Tips
  • Fits 1998-2004 GT, Bullitt, & Mach 1 Mustangs
Increase In Performance. Bolting on a Pypes Violator Cat-Back system to a stock 1998 to 2004 GT will yield an instant 8 to 13 horsepower gain. It features two of Pypes Violator mufflers for the ultimate in flow and power gains with an aggressive rude sound.

Aggressive Sound. Pypes CatBack features the Violator "Rude Sound" muffler that uses an internal louvered tube with mini sound deflector chambers that result of a unique aggressive muscle car sound.

Quality Materials. This Pypes Cat-Back Exhaust is constructed from free flowing mandrel bent 2.5" 409 stainless steel tubing and features Pypes Violator chambered mufflers for an aggressive throaty sound. The whole system is finished off with a set of 3.5" Polished 304 stainless steel tips for classic Muscle Car styling.

Application. The Pypes Violator Cat-Back Exhaust kit is specifically designed to simply bolt-on to the existing stock H-Pipe of any 1998 to 2004 4.6L GT, Bullitt, or Mach 1 Mustang for more power and a more aggressive sound.

Fitment: 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
Hardware included:
  • (4) 2.5" U clamps
  • (2) Muffler hangers
  • (2) Tailpipe hangers
  • Hardware kit (fastners, etc.)
Installation Info
Tech Specs
Cat-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5" Tip Size: 3.5"
Muffler Type: Chambered Fitment: 1998-2004 GT / Mach 1 / Bullitt Mustangs

Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • GT - 98, 99, 00, 01, 02, 03, 04

Fits GT, Mach 1, and Bullitt

Most Helpful Reviews

awsome product

Even though this product was designed for two more cylinders than my mustang(v6), it still gives it a nice "growl". Its not deep or anything..... but its nice.... like i said, I have a v6 so I dont really ...

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Helpful (1)


I just put theese on my 03 gt and they are awesome. they fit perfectly and sound great. i did them myself with my cousin (neither of us are professionals) and it was so easyyyy. the only part that was ...

Read More
Helpful (12)

Overall Rating 4.6 out of 5 stars
Read All 46 Reviews

Hey I’m Justin with, and I’m taking a closer look at the Pypes violator series catback exhaust, fitting the 98-04 Mustang GT, Mach 1, and Bullitt. Pypes exhaust systems usually feature very aggressive tones and it’s the same with the violator kit shown here. The name comes from the two violator series mufflers that this entire kit is built around. They actually feature mini sound deflectors in place of the traditional baffles, which will really allow your 4.6 to be heard. As for the construction we’re looking at full 409 grade stainless throughout, including the 2.5” mandrel bent tubing, the violator mufflers, and those 3.5” OE style polished tips. We do have this exact same kit used on our 98 GT bolt on build up, in conjunction with Pypes’ off road X-pipe which they refer to as their beast setup, and let me just say I am a really big fan of this exhaust. As for the install you will need to cut your factory exhaust just to remove it entirely but after that the new Pypes system should install without modification in about 2 hours. Now let’s hear how the Pypes violator series catback sounds compared to our factory exhaust.

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10 Questions / 11 Answers

Ask a Question

I already have a off road x-pipe would this beable to conect to it?


  • Sure! You can just bolt it right up to your new x-pipe in place of your stock exhaust!


    Good Answer (0) (0)

Show 1 more answer Question Resolved



  • Correct, this system will work on either the coupe or the convertible.


    Good Answer (1) (0)

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Can this be installed in my driveway? Are they any problems with leaks?


  • It is possible to physically install the exhaust in a driveway used proper jackstands and safety precautions. But to prevent leaks and get best results, I would highly recommend taking your stang to a professional welder to have the peices welded together once you have the exhuast installed and situated under the vehicle. Keep tabs on the weld work for about the first week to check for leaks or breaks, etc. If nothing is apparent after the first week of regualr use, you're usually good to go.


    Good Answer (1) (0)

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What headers should I use with this exhaust? What headers ?


  • This is totally independent of your headers. You can install that with stock, shorty or long tube headers because the cat back connects to your mid pipe.


    Good Answer (1) (0)

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will this work on my 04 v6 with the dual exhaust adapter? if i buy the dual exhaust adapter and then get the pypes violater catback system, will it work ? matt


  • pypes makes the violator series specifically for V-6


    Good Answer (0) (0)

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Do you have to purchase the off-road X-pipe in order to use this efficiently? I am planning on buying these for my 2000 GT convertible but was wondering if I have to buy the off-road X-pipe in order to get best results or if it will be fine either way?


  • With the stock exchaust you have now, you will have HP gains. But if your looking for the most, then yes the off road X pipe will give you that extra you want.


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Customer Reviews (46) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Loudness / Volume 4.227273 4.2
  • Exhaust Note 4.181818 4.2
  • Fit & Finish 4.090909 4.1
  • Bang For Your Buck 4.227273 4.2

  • 5/5

    October 13, 2009

    awsome product

    Even though this product was designed for two more cylinders than my mustang(v6), it still gives it a nice "growl". Its not deep or anything..... but its nice.... like i said, I have a v6 so I dont really expect it to be really deep.

    Othello W.

    Helpful (1) (0)

  • 5/5

    November 18, 2009


    I just put theese on my 03 gt and they are awesome. they fit perfectly and sound great. i did them myself with my cousin (neither of us are professionals) and it was so easyyyy. the only part that was a little tough was getting the old exhaust out since mine was kinda rusty. thanks AM it arrived next day and sounds beautiful.


    Year: 2003 Submodel: GT

    Helpful (12) (1)

  • 4/5

    June 01, 2010

    Pretty Good

    I Ordered This Catback Bout A Week Ago...Sounds Great But Only Prob Was That Its Not Bent Right For An 04..The Right Side Pipe Hits Axel And Breather On The Bend Over The Axel...Had It Pro Installed Other Than That Sounds Great ! And AM Had It To My Door In No Time Thanks AM!!!

    Jeffery P

    Year: 2004

    Helpful (6) (0)

  • 5/5

    October 24, 2007

    let the neighborhood know your coming

    I recently installed the Pypes violator dual exhaust kit with the off-road x-pipe on my 03 v6 Mustang. This exhaust adds enough horsepower to throw you back in your seat and is throaty enough to wake the neighbors. If your considering an aftermarket exhaust, this is the one and is offered at the best price here at American Muscle. Thanks American Muscle for providing such a great product and speedy service.


    Year: 2003 Submodel: V6

    Helpful (10) (5)

  • 4/5

    Installation Time: Afternoon

    January 18, 2014

    Nice Sound

    Installed on my 98 GT with BBK shorty headers and BBK off road H. Sounds good, def on the loud side. The hangers on the tips ARE NOT correct for the 98. We had to make our own hangers. Other than that, happy with the exhaust so far. Been on for 7 days now.


    Year: 1998 Submodel: GT

    Helpful (2) (0)

  • 3/5

    Installation Time: Afternoon

    February 07, 2013

    pypes violator

    had a flowmaster before was on for 10 years plus really nice sound could not remember the model # had a muffler go bad just enough rust wanted to replace it all so i read up on this model with a "rude sound " its ok alot less quiet throaty than before sitting at idle barely here it running to me it is not to much louder than factory exhaust does not sound bad when on the gas better than factory but over all would say it is ok not sure if i am going to replace it or not its not horrible but was not what i was expecting to hear from it if going from factory or a fairly quiet exhaust to this one would be ok


    Year: 2000 Submodel: GT Defiance, OH 43512, USA

    Helpful (2) (0)

  • 5/5

    March 06, 2010

    I love pypes

    I have a 2003 mustang gt with K&N intake, roush 75mm TB, mac O/R h pipe, diablosport predator tuner and the PYPES violator cat back kit w/ the 3.5" tips. the most noticable performance improvement was the cat back not to mention the sound!!!! yes it is extremely loud when you uput your foot in the floor but when you are just cuizing through town it is no louder than stock it is very nice sounding, here is a link to my video on youtube

    Anthony Brubaker

    Year: 2003 Submodel: GT

    Helpful (4) (2)

  • 5/5

    November 22, 2008

    Loud at Take Off

    I purchased these pipes in November and had them professionally installed. Good thing I did b/c it took over 5 hours for 2 mechanics to do the job. It doesnt sound that great at idle, but once you get on the gas the sound is strong. Dont attempt to install yourself!!!

    Steve K.

    Helpful (3) (2)

  • 3/5

    Installation Time: Less than 1 Hour

    January 18, 2014

    Nice sound

    Okay well the only BAD thing I ran in to was at the end, the passenger side pipe that goes over the rear axle was incorrectly bent. So it hangs dramatically lower then the driver side. So Lowe it scraps on speed bumps, but at the end of the day it works out let me tell you why. With those pipes that go over the axle you don't get the 100% raspy sound you paid for. Soo I took the pipes off and just left the mufflers and I think it sounds perfect. Soo FYI PRE-bent parts might not always fit you're car. 7 out of 10


    Year: 1998 Submodel: GT Kansas, USA

    Helpful (1) (1)

  • 5/5

    Installation Time: Afternoon

    May 10, 2013

    Pypes Violater Cat Back Exhaust

    Everything went well and the fit was perfect. My only problem was getting the pipes to get over the rear axles. I removed the shocks from the bottom and then all went in easy. The directions said to remove the rear wheels for easier installation, but I only removed the passangers side wheel, on the drivers side I didn;t, just the shocks. Unscrewing the nuts at the bottom of the shocks allowed the rear axel to drop enough to get the pipes over it.


    Year: 2002 Submodel: GT Fredonia NY USA

    Helpful (1) (1)

  • 5/5

    January 23, 2008


    This exhaust with the Pypes off- road x-pipe sounds so good.


    Helpful (1) (1)

  • 3/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    June 03, 2014

    ok but not great

    very loud but glasspack sounding tips did not want to fit on the ends pass side did not want to fit over axle and car feels like it lost power


    Year: 2000 Submodel: GT

    Helpful (0) (1)

  • 5/5

    Installation Time: Afternoon

    June 29, 2016

    Not to Loud

    I just put this on my 04 GT with the stock H pipe it is a little bit louder than stock but not much it is just what I wanted. I did it myself on a hoist but it would have been easier with help holding parts in place and getting everything lined up.


    Year: 2004 Submodel: GT

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    May 24, 2016


    Great sound and very easy to install would suggest to any one


    Year: 2002 Submodel: GT

    Helpful (0) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 13, 2016

    97 gt violator cats

    This catback system has definitely waken up my ride. Supporting it, i have shorty bbk headers, and bbk h-pipes. Its sounds incredible!! Although louder than i wanted. One thing i was worried about, was loosing that distinctive mustang know the one..."oh yea, that was a mustang!" I saw my brother on the other side of the median heading the opposite direction. I stomped on it as he passed. 2 mins later in sent me a "lol wow". When i saw him later he said, he heard it and was like "What Was That"!. Looked through his window and saw my car. Thats when he sent me the txt. So yeah, im very happy with this purchase. Yet again, thank you AmericanMuscle.


    Year: 1997 Submodel: GT

    Helpful (0) (0)

  • 1/5

    Installation Time: Less than 1 Hour

    March 27, 2016

    Violator catback

    When I order this system I had read and listened to many review online and YouTube videos. The sound is ok but what I wasn't happy about was the quality and manufacturing of the exhaust. I wouldn't recommend this system to anyone


    Year: 2003 Submodel: GT

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    January 11, 2016

    Amazing Exhuast!

    The install part wasn't too bad it took us about 2 hours and it was fun doing it. When we took the car off the jack stands and fired it up, I was instantly satisfied with the product! The nuts and washers the set comes with are awful so go to lowes and get your own or use the factory nut. 10/10


    Year: 2004 Submodel: GT Dallas, TX

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    July 19, 2015

    big improvement over stock

    Installed in less then 3 hours. Fit nicely and sounds great. Not overly loud but enough to give the car the right sound but not enough to be annoying while driving on long trips. Hardest part of install was removing old pipes (rusted bolts) install was a breeze. would highly recommend


    Year: 2002 Submodel: GT NJ

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    March 25, 2015

    Great Sound

    I installed this at my friends shop so I had it easy. I noticed some said the bend was not right for the 04 but mine fit fine might be a cases by case or ...As fas as install it was easy straight forward every thing you needed was there. Install time was no more than expected. I like the sound at an Idle it sounds normal to a little beefer kinda like a sleeper though when you hit the throttle all the sound you want is there for sure. I would recommend it Gives a bit of a surprise to people when they pull up next to you and they dont here much


    Year: 2004 Submodel: GT Sanborn, NY

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    August 08, 2014

    Thy are awesome

    Thy fit great, and sound awesome. I would recommend them to anyone.


    Year: 2004 Submodel: GT

    Helpful (0) (0)

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