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Roush Extreme Performance Catback System (05-09 GT, GT500)

39 Reviews
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  • Item #69110
  • MPN #403936
  • Market Price $656.63
  • You Save 12% ($80.64)
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Customer Photos
  • Deep off-road exhaust tone
  • Muffler delete; Mid resonator design
  • 2.5" stainless steel tubing
  • 304 stainless steel tips with Roush logo
  • Fits 2005 to 2009 GT and GT500 Mustangs
Aggressive Muscle Car Sound. Let your engine howl with a Roush Extreme Performance Catback System. This innovative Roush exhaust system features a muffler-delete design with resonators mounted directly after the mid-pipe, that results in increased air flow, and a unique sound, with no in-cabin exhaust drone. Quality Roush Construction. Constructed from CNC mandrel bent 2.5" diameter stainless steel tubing for a durable long life, the Extreme Performance Catback System features two 304 polished stainless steel 4" tips with embossed "ROUSH" logo.

Application. This Roush Extreme Performance Catback System will fit the 2005 to 2009 GT and 2007 to 2009 Shelby GT500 Mustangs with the stock factory rear valance.

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. Click here for details.

Mustang Fitment: 2005 2006 2007 2008 2009 Details

What's in the Box
  • (2) catback pipes with mufflers
  • (2) Muffler assemblies
  • (2) Clamps
Installation Info
Tech Specs
Catback Exhaust Specifications
Piping Material: Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5" Tip Size: 4"
Muffler Type: None / Resonator Fitment: 2005-2009 GT & GT500 Mustangs
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09
  • GT500 - 07, 08, 09

Most Helpful Reviews View All

Overall Rating 4.9/5 Write a Review

Paired this catback with the pypes x-pipe on my 2006 V6. Just the best sounding V6 I've ever heard. Easy installation, awesome tone, no drone, and the heavier the throttle the better sounding it gets.

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Helpful (4) (0)

Wow! What a difference.

I had the Magnaflow Axlebacks on for close to 6 years prior to finding an exhaust sound clip of the Roush Extreme online. I knew that I wanted to upgrade to the Roush! Let me say the sound clips sound

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Helpful (3) (0)

Customer Photos (18) View All

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Q & A (9 Questions, 7 Answers) Ask a Question

Would it fit my v6?

TyTy Year: 2008 Model: V6

Question Resolved
Good Question (1) (0)
  • You could install this Roush Catback, or any other GT catback of your choice, when combined with the Cut and Clamp X-pipe which I've attached below for you. Essentially, you'd be converting to dual exhaust. The x-pipe will reuse your stock catalytic converters and then bolt up to whichever GT catback you decided upon. Hope this helps!

    Helpful (4) (0)

    Best Answer

    LisaS Year: 1992 Model: GT

Show 1 more answer

What headers? I have the roush exhaust on my 08 gt and i want to change the headers...i dont know whether to get the long tub or short headers to make it fit the exhaust without having to cut into the exhaust or header.

TheHooningZ3 Year: 2008 Model: GT

Question Resolved
Good Question (0) (0)
  • Shorty or long tube it is your preference no cutting is necessary. If you have an after market mid pipe you will have to change to a shorter mid pipe for long tubes. Factory mid pipe and cat back can be used with shorty headers. If you notice AM has shorter mid pipes for long tubes, and they will specify in description also... Hope this helps sinseraly Mathew wright.

    Helpful (1) (0)

    MustangSally71 Year: 2000 Model: GT

    Top 500 Contributor

Show 1 more answer

Do I have to Change my mid pipe? I have been looking for a while on trying to make my '07 California Special louder. I have listened to a countless amount of sound clips trying to figure out what I like best. After hearing this system on the Internet I think I found what I have been looking for. I was wanting to know if I needed to change to a different mid pipe. I love the deep muscle car note with the h pipe over the race car growl with the x. I hope to keep the h for this system. Will I be able to?

Sean92 Year: 2007 Model: Other

Question Resolved
Good Question (1) (0)
  • You do not have to change your mid-pipe for this particular catback system (I have this exact one in my car). You will gain a louder sound, especially because this system has resonators (that don't drone!) and no mufflers. However, if you want louder, deeper sounds, replacing your mid-pipe is a strong suggestion. Either go with an H-pipe or Pro-Chamber (even a little deeper sounding than H). Even better, if your state allows it, go sans catalytic converters (ie. off-road). You get a louder sound, cut weight from the existing (read: heavy) exhaust system, and also increase MPG as the car can breath and flow exhaust better. The choice is, of course, yours but at the end of the day, you can keep your existing mid-pipe as is.

    Helpful (2) (0)

    Best Answer

    Rooce Year: 2008 Model: GT

    Top 1000 Contributor

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Reviews (39) Write a Review

  • 5 Stars .95 95%
  • 4 Stars .05 5%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

38 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:$100-$250

  • Loudness / Volume: 4.871795 4.9/5
  • Exhaust Note: 4.897436 4.9/5
  • Fit & Finish: 4.948718 4.9/5
  • Bang For Your Buck: 4.871795 4.9/5
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  • 5/5


    January 13, 2014

    Paired this catback with the pypes x-pipe on my 2006 V6. Just the best sounding V6 I've ever heard. Easy installation, awesome tone, no drone, and the heavier the throttle the better sounding it gets. Highly recommend this product, and it's cheaper than other systems. Kudos Roush Performance and American Muscle!


    Year: 2006 Model: V6 Driving Style: Show 'Stangs I have owned: 2 Laguna, California

    Helpful (4) (0)

  • 5/5

    amazing tone and growl

    December 06, 2013

    i have a 2006 gt. had borla stingers with bbk o/r x pipe. sold the borla and went with roush and bbk midpipes. sounds great and is exactly what i was looking for. very aggressive. i highly suggest this exhaust to anyone wanting that mean and aggressive sound. thumbs up. cant complain about the price either.


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 sc

    Helpful (3) (0)

  • 5/5

    The Sound of Performance

    February 13, 2013

    This product is awesome makes the sound and performance incredible, one must be careful not to get speeding ticket, because the faster you go the better the sound gets.


    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 fl

    Helpful (3) (0)

  • 5/5

    Wow! What a difference.

    June 19, 2012

    I had the Magnaflow Axlebacks on for close to 6 years prior to finding an exhaust sound clip of the Roush Extreme online. I knew that I wanted to upgrade to the Roush! Let me say the sound clips sound good but the first time you turn that key after installation is mind blowing! The Magnaflow's sounded O.K. but they were quiet and never really captured that old school Mustang sound. The Roush delivers;you won't be disappointed!


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Creedmoor,N.C.

    Helpful (3) (0)

  • 5/5

    Whoa Horse!

    December 05, 2013

    First, I'd like to commend American Muscle for the fast and free shipping. What a wonderful company. Thank you! The exhaust came fast and well packed. I had the Roush Extreme Performance catback exhaust installed just a few hours ago at my local shop and I am so, so happy with it that I'm almost in tears. After months of debating over axleback and catback, I settled on Roush primarily because of the trusted name-the reviews weren't bad either!! The 4" embossed tips are just gorgeous and the fittment is supreme. The sound? I had absolutely no idea how weak the stock exhaust sounded - in fact, I have already forgotten about it! The Roush Extreme can be felt in the seat of your pants and rumbles such a deep, lush and PERFECT tone. Like other reviews on this product, it can be tame when you want it, but on acceleration and especially WOT, it just growls; it means freaking business. It produces a true muscley, throaty, gutteral, bubbling and spitting sound that blends so uniquely well together. It's almost like I have a brand new ride. Taking the time to write this review is killing me, because I would honestly rather be out driving right now! I whole heartedly recommend this product a hundred times over. I would recommend foregoing ANY axleback system, save your money if that is what it takes and buy this! The Roush Extreme Performance -IS- THE WAY TO GO! You will not be disappointed....


    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Georgia 316, GA, USA

    Helpful (2) (0)

  • 5/5

    Sounds amazing!

    March 11, 2013

    Just installed this system on my 07 GT, and I must say it sounds VERY good! Install time using my garage without a lift was about 2.5 hours taking my time. I recommend using a lift if you have access to one would probably reduce install time by 40-50%. The hardest part is removing the stock exhaust, the Roush kit was installed with little to no trouble at all. Exhaust drone is almost non-existent. The note that this system yields is a deep and aggressive at idle and cruise but really sounds amazing under acceleration. If you want volume with a deep, aggressive and refined note, this system is for you!


    Year: 2007 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Dalton, GA

    Helpful (2) (0)

  • 5/5

    In search of the lost tone

    September 27, 2012

    Quality and fitment are off the scale! This was an all out exhaust makeover for my baby. Installing detroit rocker cams, kooks long tube headers w/ high flow cats and x-pipe and the Roush Extreme. I have to admit the lack of an axle back muffler on my convertible was just way too loud for my taste. I ended up leaving the Roush mid pipes installed and reinstalled my Flowmaster Hushpowers. I now truly have the late 60's rumble and tone I was searching. If you are there in August 2013, you will hear the roar of the Roush Extreme when the the axle back pipes are reinstalled just in time for the next AM mustang show and the muffler (or non muffler) wrapping contest. :-)


    Year: 2008 Model: GT Driving Style: Show 'Stangs I have owned: 3 Ashburn, VA, USA

    Helpful (2) (0)

  • 5/5

    How a mustang should sound!!!

    June 22, 2012

    Let me first off and say i had just the Pypes pype bomb axleback for over a year and loved them. They were loud, and aggressive, but i wanted the whole catback system. So i decided on the Roush, i almost went with the Pypes M80 system but heard that it had fitment issues. So now to the Roush exhaust. Its loud, aggressive, and has a deep sound. And there is no drone from this exhaust. It sounds like a true muscle car! But at the same time its quiet when u want it to be. But at WOT ITS SOUNDS AMAZING! Fitment was perfect, took about a Hour to put it on with floor jacks and floor stands.


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5+ Richmond, VA

    Helpful (2) (0)

  • 5/5

    Best sounding exhaust out there

    April 09, 2012

    I had it installed and it took about 1.5 hours using a lift. It's really not all that loud when your letting it idle. When you get on the gas it rips though. Right after it was installed I had another guy go drive it down the road so I could hear it from where I was at, sounded amazing. I haven't heard a Mustang sound better. Inside though is not bad. You can tell they're back there but they are not that loud. Great Exhaust!


    Year: 2005 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 KY

    Helpful (2) (0)

  • 5/5


    April 15, 2014

    I looked for months trying to decide on what exhaust to buy. I glad I picked this one for my 45th Anniversary addition GT with automatic transmission. It will let you sneak through town, but then you know that that you are driving a Mustang when you open it up. There is absolutely no drone at any rpm or load. Also the 4" tips help to balance the appearance at the back of the car against the large tail lights. I did the install myself and was about 1 1/2 hours start to finish. I must add the fit was perfect.


    Year: 2009 Model: GT Driving Style: Show 'Stangs I have owned: 1 Western MD

    Helpful (1) (0)

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