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Pypes The Beast Off-Road Mid-Muffler Exhaust (05-10 GT)

Market Price $710.99 You Save 23% ($167.01)
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  • Item 20065
  • MPN# SFM66B

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Features & Details

  • Maximum Sound and Maximum Flow.
  • Includes Off-Road X-Pipe and Mid Muffler Cat-Back.
  • 409 Stainless Steel Construction.
  • Fits 2005-2010 GT Mustangs.
The Beast. The Pypes Beast kit for the 2005-2010 GT Mustang combines Pypes 409 Stainless Steel Off-Road X-Pipe with their 409 Stainless Steel Mid Muffler Cat-Back for Maximum Sound and Maximum Flow.

Pypes Off-Road X-Pipe. Pypes Mustang Off Road X-Pipe Crossover pipes are second to none when it comes to balancing out the exhaust gas pressure in your system. Constructed of sturdy 16 gauge 409 Stainless Steel tubing, each pipe bolts up perfectly in the stock position.

Pypes Mid Muffler Cat-Back. Middle-Muffler catback Exhaust from Pypes is the last exhaust system your 2005-2010 GT Mustang will ever need! The system is built to last, constructed from high quality 409 Stainless Steel. It features two M-80 Bullet Style mufflers for ultra high flow and an ultra aggressive sound.

Technical Note: Americanmuscle recommends adding the 2005+ Mustang 304 Stainless Steel Exhaust Hanger Kit from the drop down option above, to provide more strength, stability and a cleaner installed appearance. If you have a 2007 Mustang you may need the kit for correct installation.

Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (1) Off-Road X-Pipe
  • (2) Down pipes
  • (2) Muffler assemblies
  • (2) Over axle pipes
  • (2) Tailpipes
  • (10) 2.5" clamps
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard length "X" Type Headers Required: Shorty
Piping Material: 409 Stainless Steel Piping Size: 2.5"
Catalytic Converter: "No" - For off-road use only Fitment: 2005-2010 GT Mustangs

Cat-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5" Tip Size: 4"
Muffler Type: Straight-through Fitment: 2005-2010 GT Mustangs
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

People Who Bought This Item Also Bought

Most Helpful Reviews

On the Track

Use this exhaust on my '08 GT race car. Averages around 93db WOT close to redline in 4th gear with 3.73 and stock exhaust manifold (mandated by class). Been running this exhaust for one complete season ...

Read More
Helpful (3)


There isn't a word to describe this exhaust. If you hate your neighbors and want to annoy everyone in your town this is the exhaust to do it with. There is no sounds on the Internet that you car hear that ...

Read More
Helpful (2)

Overall Rating 4.6 out of 5 stars
Read All 18 Reviews

Customer Photos (3) Submit Your Photo

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6 Questions / 6 Answers

Ask a Question

do i need to buy the high flow cats to install this or can i use mt stock ones?


  • With this Pypes Off-Road Exhaust, it would be recommended to use the Pypes High Flow Catalytic Converters, linked below, but you could reuse your factory cats. Pypes High Flow Cats:


Helpful (0)

would this kit bolt up to a factory 2007 v6 factory headers or will there need to be aftermarket ones?


  • Hi,This Pypes The Beast Off-Road Mid-Muffler Exhaust is designed to be used with a 05-10 GT and 08-09 Bullitt Mustangs, For a 2007 V6 you will need the Pypes Mid-Muffler True Dual Exhaust Item #20126. Heres the link

    Chris J

Helpful (0)

Is this exhaust compatible with the Pypes long tube headers?


  • Hi, This Pypes The Beast Off-Road Mid-Muffler Exhaust is designed to be used with the stock manifolds or shorty headers, we do offer a similar kit that comes with long tube headers called the Pypes Beast Super System Item #20122 Here is the link

    Chris J

Helpful (0)

Will this exhaust fit stock headers? Do I need shorty headers for it to fit?


  • Yes, the Pypes The Beast Off-Road Mid-Muffler Exhaust (05-10 GT) will work with stock headers as well as any after market shorty header.


Helpful (0)

do you know if this exhaust will fit a 2008 GT500?? without any modifications


  • It would definitely require modifications because the Pypes The Beast Off-Road Mid-Muffler Exhaust (05-10 GT) is specifically designed for the GT model, not the GT500. Because this exhaust is designed for a GT the diameter of the piping will be smaller than your stock exhaust.


Helpful (0)

Engine running lean? with out a tune will this make the engine run to a un safe lean condition?


  • No. It will be perfectly safe without a tune. You will however have an engine light and no back pressure so the peddle will feel very sloppy. You need the tune to fix the throttle response.


Helpful (0)

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Customer Reviews (18) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 5 5
  • Exhaust Note 4.833333 4.8
  • Fit & Finish 3.333333 3.3
  • Bang For Your Buck 4.833333 4.8

  • 5/5

    September 20, 2010

    On the Track

    Use this exhaust on my '08 GT race car. Averages around 93db WOT close to redline in 4th gear with 3.73 and stock exhaust manifold (mandated by class). Been running this exhaust for one complete season with no issues at all. Fans always comment on how good it sounds. Sound readings by sanctioning body's certified equipment so consistently accurate.


    Year: 2008 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    November 13, 2014


    There isn't a word to describe this exhaust. If you hate your neighbors and want to annoy everyone in your town this is the exhaust to do it with. There is no sounds on the Internet that you car hear that will remotely describe this exhaust.


    Year: 2008 Submodel: GT New Jersey, USA

    Helpful (2)

  • 5/5

    December 03, 2010


    exhaust is loud but that is exactly what i was looking for...installation was pretty straight forward....nothing real hard.....would recommend an impact for removing the stock car already turned heards but now it gets almost anyones attention..even got a compliment from a state trooper...would recommend this product to anyone looking for a meaner louder stang

    Steven Onley

    Helpful (2)

  • 5/5

    June 09, 2010

    the name says it all

    the name says it all. it is beyond loud!!!!!! may be too loud for me in cali.... but over all it does what it says.


    Helpful (2)

  • 4/5

    February 25, 2010


    i got this around may of last year. had the xpipe installed with bbk headers sounds awsome. very loud however got pulled over for driving like a mad man when i was barly accelerating. Mustang CEL turns on and no way to get around it without a tune


    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    June 05, 2017


    The exhaust is so loud and aggressive literally so happy I got the beast exhaust.


    Year: 2010 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Full Day

    April 25, 2017

    The Beast

    System sounds great as one would expect. Plan on spending a day for installation and definitely use a hoist! The fit was great all except the tailpipes. But it's what you would expect for a pre-bent system.


    Year: 2006 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    December 29, 2014

    Neighbors Are Not Happy

    First aftermarket exhaust set up. Read all the reviews on here and forums, Knew there would be fitment issues to be worked out. I installed my self on jack stands. Had the muffler hit the gas tank and fought hard to fix that. Obviously the hangers were off just like everyone else said but other than that GREAT product. Amazing sound. you should buy this, insanely loud, everyone looks.


    Year: 2006 Submodel: GT Alabama

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    March 05, 2013

    Pypes Beast

    This combo fit in with little effort and looks great! At first the exhaust was a bit raspier than I was hoping for, but that quickly changed. I know exhausts need to get "broken in" and after just a few days now it is a LOT better. It is still on the raspy side, but with an x-pipe you need to expect that, but its just the right amount of rasp. My neighbors I am sure are already starting to hate me. With my race tune and cold temps (it was 38 yesterday) it idled at above 2500 for 15-30 seconds, and as you can imagine was very loud! Sounds great though! Not sure how much I will like it with long tubes though, might be too loud then, we will see.


    Year: 2007 Submodel: GT Jupiter, FL, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 23, 2012

    Pypes is where its at!!!

    i bought my 06 GT with a welded in aftermarket X-pipe and the american thunder axlebacks from Flowmaster. This was definitely not loud enough to represent my black stallion how i wished. I purchased this kit to match up to my BBK tuned-length shorty's and i must say its the best thing I've purchased for the stang to this day!!! Ford Racing 4.10's from AM keep it in the powerband for constant screaming sound and a perfect growl that turns everyones head from the strip to the interstate. Fitment was perfect, just make sure you have the factory 4 hangers after the axle and your 2 on the trans crossmember and its a quick 2 hour job on a shop floor!!


    Year: 2006 Submodel: GT Fort Payne, AL, USA

    Helpful (1)

  • 5/5

    June 21, 2011

    Far from bolt on...

    I bought this kit last week and tryed to install it in a day... bad idea. Make sure you make it a weekend project. And make sure you have a welder and a tailpipe expander close. The two tailpipe hangars are so far off its rediculous.

    Matthew Gooch

    Year: 2005 Submodel: GT

    Helpful (1)

  • 4/5

    April 27, 2011

    LOUD, Deep, Rust Proof

    I've had this system on my car for 2 years now. It's gotten deeper and deeper with age. The system still doesn't have a spot of rust on it. My only complaint is the fit, although bad, it's not perfect.


    Year: 2005 Submodel: GT

    Helpful (1)

  • 5/5

    November 27, 2010


    After spending some time looking for the right exhaust kit for my 2007 CS/Mustang I went with Mid-Muffler. Man! best sound for 05-07 stangs. Loud! But but love it!

    Torch Red

    Year: 2007

    Helpful (1)

  • 4/5

    October 08, 2010

    Full Race Sound

    At W.O.T. it sounds like the space shuttle launching.. Really, this system is too loud for the street. But if thats your thing, then you won't be disappointed!


    Helpful (1)

  • 5/5

    October 09, 2009

    The Beast

    I have this setup along with bbk shorty headers bbk throttle body and CAI. The name of this product descibes it, it is a beast. Very loud even with the cats. Very little to no drone while cruising. Your neighbors will know when your coming home from about 2 blocks away. Overall very satisfided with the sounds and performance, thanks AM


    Helpful (1)

  • 4/5

    September 23, 2009

    Unleash the Beast

    Put this on on 07 Grabber with the Pypes shortie headers, no cats, a bbk throttle body, and a Steeda full CAI...For sure not for the faint at WOT this combo is LOUD LOUD...really the only thing that I have heard that is louder is a joke... At moderate throttle and while cruising there is no drone and its nothing a couple cranks of the stereo won't cover...I like it...doubt the neighbors will :)

    DJ Sterrett

    Year: 2007

    Helpful (1)

  • 4/5

    May 21, 2009

    The Beast

    Put this on my 06, along with some bbk Headers, very loud, however without the headers it sounds a little high pitched like a tuner, once the headers were on however it sounded like a lion


    Year: 2006

    Helpful (1)

  • 5/5

    February 27, 2010

    Truly A Beast!

    I had this exhaust system installed about 2 weeks ago and WOW it is truly a beast! its very loud my parents can hear me coming from three blocks truly satisfied with the pypes system.thanks am


    Helpful (0)

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