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

Market Price $649.99 You Save 4% ($25.00)
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  • Item 69110
  • MPN# 403936

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    Features, Video & Details

    • 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

    Review & Installation Video

    Review & Install Video

    The Roush Extreme Performance Cat-Back System is available for any 2005 to 2009 GT or Shelby GT500 owner, who's looking for a muffler delete style exhaust that has a unique hollow growl, deeper and more aggressive than stock. Since this is a straight pipe design, the cost is kept at an affordable level around the $600 mark, making it easier on your wallet. Installation doesn't require any cutting or modification, so except one out of three wrenches on our difficulty meter, which we'll talk more about later on. Taking a closer look at the sound you just heard from this kit, Roush has put together a super aggressive cat-back that absolutely fits the muscle that the GT500 puts out. Both the Shelby and the GT models get a noticeable change in tone, and that's what makes this kit so unique. It's got the deep growl, but the tone sets it apart from others thanks to the lack of mufflers. Also, contributing to this is the incorporated mid-resonator design here just after the mid-pipe. Together this sound is loud enough to catch all the attention leaving your local car show, while having virtually no drone inside the cabin, because sound is more effectively directed backwards to the system, and out to through the rear. With all that said, I'm giving this four out of five on our loudness meter. It's definitely loud, but I don't think it'll wake as many neighbors as say the Borla Atak or the Corsa Extreme. One of the things people tend to forget when checking out an exhaust system like this is it can actually help slightly improve fuel efficiency. This is simply due to the fact that the engine runs into less air resistance and do it's job, ultimately leading to an increase in horsepower and tork as well, thanks to the higher flow system compared to a conventional one. Roush has this system CNC machine from Mandrel Bends that increase air flow through the 2 and a half inch 409 stainless steel tubing. This material is great for durability, and it's a good choice for those located in wintery weather areas like us here on the east coast since it'll hold it's own against salty roads longer than the aluminized options. To top it off, you'll see the 2 big 4 inch 304 stainless steel polished tips with the Roush logo embedded into the metal. This is definitely a styling bonus for the rear in my personal opinion. This is currently the only full cat-back with a muffler delete design available for the GT and Shelby models on AM. Given the fact it's 409 stainless, and one of the better materials on the market, I would've expected a higher price tag. The lack of mufflers did help to keep the price just about the $600 mark, making this a super affordable way to get some serious volume and tone out of your motor. You want to be heard, but you don't want to wake up the block, or annoy your significant other with the drone, this is definitely a good way to go. The insulation as I mentioned earlier will not be requiring any drilling or cutting or any of that nonsense, so you can expect a direct bolt on job here with simple hand tool like a ratchet, a 15 millimeter socket, as well as some jack and jack stands, or a lift if you have access to one. Overall, this shouldn't take longer than an hour or so in the driveway or garage, so I'm giving it one out of three wrenches on our difficulty meter. You'll obviously want to start off by getting the car in the air and support on jack stands or a lift. Once you're underneath you can unclamp the factory mufflers from the over axel pipes using a 15 millimeter, and then pull them out of there hanger isolators, setting them aside. From here, you can unclamp the over axel pipes from the factory h pipe or after market mid-pipe, if you have one, then set those aside as well. Pick up your new over axels from Roush with the included resonators you see here, and clamp them to the mid-pipe. From here, you can do the same with the muffler delete axel back portion of the system, then hook them into the hanger isolators in the factory locations, and you're good to go. That pretty much wraps up my overview and install. So, if you're the owner of a 2005 to 2009 GT or the lucky owner of a Shelby GT500, you might want to check out the Roush Extreme Performance Cat-Back Exhaust System. You can find it right here at americanmuscle.com.

    Aggressive Muscle Car Sound. Let your engine howl with a Roush Extreme Performance Cat-Back 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 Cat-Back System features two 304 polished stainless steel 4" tips with embossed "ROUSH" logo.

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

    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 Details

    What's in the Box
    • (2) catback pipes with mufflers
    • (2) Muffler assemblies
    • (2) Clamps
    Installation Info
    Tech Specs
    Cat-Back 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
    Will it fit my Mustang?

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    38 Questions / 48 Answers

    Ask a Question

    Would it fit my v6?

    TyTy

    • 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!

      LisaS

    Show 1 more answer Helpful (2)

    Will this system pass California Smog inspection?

    ArtM

    • This Roush Extreme Performance Cat-Back System will not alter emission outputs and therefore will not single-handedly cause a smog inspection failure.

      AMJEFF

    Helpful (1)

    What's the loudest exhaust setup I can possibly do available on American muscle

    Kev

    • Hey Kev, So the loudest exhaust system would consist of longtube headers, an off road x pipe, and a resonated cat back system. Kooks long tubes with kooks off road x pipe, and either a roush extreme, flowmaster outlaw, pypes pype-bomb, or borla atak catback systems to finish the package. Those will be the loudest set ups that we carry.

      Cobra_Machine04

    Helpful (1)

    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

    • 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.

      Rooce

    Show 2 more answers Helpful (1)

    Will this fit to a Pypes O/H pipe ?

    DanielH40

    • This will work with the Pypes off road mid-pipe yes.

      AMRickyD

    Helpful (0)

    Hello, I was wondering if there is an option to just buy the intermediate pipes? I bought just he axle back but regret not getting the full set up

    AnthonyF

    • Unfortunately, we do not have the cat-back pipes separately from this kit. We do offer the MAC cat-back pipes that are compatible with the Roush axle back exhaust here: https://www.americanmuscle.com/mac-25-stainless-steel-catback-pipes-0510-gt-v6.html. If you wanted the pipes from this exact kit, you may be able to source them from Roush Performance directly.

      AMJalisaB

    Helpful (0)

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.701755 4.7
    • Exhaust Note 4.894737 4.9
    • Fit & Finish 4.675438 4.7
    • Bang For Your Buck 4.710526 4.7



    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 15, 2018

      5 stars

      Sounds awesome! Super deep rumble, no drone on the inside but you can hear the power behind it. You'll get in and think it's too quiet but if you get behind the car and ask someone to step on it, you'll be smiling for a week.

      GlynB

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 11, 2018

      Very Happy Stang Owner

      This product is awesome I installed it on an 07 GT, in about two hours, amd only had the car on jackstands.

      MyronB

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      July 09, 2018

      Sounds great!

      Really impressed with my new exhaust, couldn’t be happier... my neighbors are starting to hate me but I don’t like them anyway hahahaha

      PeterH

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 08, 2018

      Aggressive Sound!

      I bought this exhaust as a replacement for the exhaust that was on my 2008 Mustang GT when I bought it, which was a rusted and rotted flow master exhaust with mufflers. Couldn’t stand the look and figured I could use a new one. The sound isn’t necessarily louder than my old one, but it does sound a lot better and my car drives smoother. Installation, I can’t exactly give a time on how long it took as me and my step dad were just enjoying working on a car again together. But I will say fitting the cat back piping was a little hard while under jack stands. Took some complicated twisting and turning to get in place. But overall the result were amazing even with stock headers. If your looking for that aggressive old school muscle car sound, I’d say go with this exhaust.

      Dylan

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 05, 2018

      Good fit and sound

      Excellent fit and sound but EXTREMELY LOUD with headers.

      KevinO

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Full Day

      July 03, 2018

      Awesome exhaust!

      I have a 2008 V-6 with dual exhaust and headers. I recently had Magnaflow catalytic converters, MAC Pro H-pipe and Rousch Cat-back exhaust system installed. My mechanic had minimal issues with the installation. The setup is awesome! While driving at a steady speed, there's not much noise. However, when you put the pedal to the metal, someone knows that they are about to be run over! It has a VERY throaty sound!!!

      TimothyD

      Year: 2008 Submodel: V6

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      June 22, 2018

      ROUSH EXTREME PERFORMANCE CAT-BACK EXHAUST

      I would have to say this is the Best Exhaust note I have heard so far. I have tried different exhaust set ups on my car and this is by far the perfect exhaust note if you are looking for that Old School Muscle car sound. It's a little loud on cold start at first but it settles down to a nice Deep Rumble when she warms up. Keep the rpm's down to around 2 to 3,000 and you will be able to ride around your neighborhood without having the neighbors give you that angry look. *** Here is a list of the set ups I did with the results: *** * Stock Manifolds / H-Pipe with Magnaflow Catback exhaust = Not much louder than stock. * Stock Manifolds with Pypes O/R H-Pipe with Magnaflow Catback exhaust = Not bad sound but the exhaust fumes were bad in the car. * Stock Manifolds with Pypes O/R H-Pipe with Roush Catback exhaust = Too loud - you will be hated by your neighbours and everyone around you while cruising. * Stock Manifolds and H-Pipe with Roush Catback exhaust = Old School sound / Wife approved I would highly recommend this exhaust if you keep your stock Manifolds and H-Pipe on your car.

      Roly

      Year: 2005 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      June 20, 2018

      Awesome Sound

      I had these installed and was a little hesitant of how loud they would be but after starting her up they sound so good that that hesitation went away!!

      RandyW

      Year: 2009 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      June 19, 2018

      Exhaust

      Good sound and looks good. Only took an hour to install by a professional

      KurtisS

      Year: 2005 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      June 11, 2018

      Best sound!

      Best exhaust for the 3v! Could not have asked for a better sound. A lot louder than in video.

      JaimeS

      Year: 2008 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      June 09, 2018

      Awesome sounding exhaust!

      This is the perfect sounding exhaust for my 06 GT. I have an Airaid MXP intake, BBK 62mm throttle body, Pypes headers and a Magnaflow axle-back exhaust. I wasn't pleased with the sound so after reading reviews and watching videos on YouTube, I pulled the trigger and ordered this and am I glad I did. It completely changed the tune of the car. Very throaty, deep rumble, great sounds on downshifts and awesome sound at idle. The only issue was getting the old exhaust off the clamps at the H-pipe as we didn't have a lift and had limited clearance with using jack stands. Once that was off, the rest of the install was a breeze. I probably went through 3/4 of my tank driving all over with the windows down enjoying every crackle and sound of this exhaust. If you are worried this may be too loud, don't be. It makes the car sound terrific and you even feel some more power in the higher powerband. I would highly recommend. If you do purchase, I would recommend some penetrating spray to assist with the removal of the clamps at the H-pipe.

      RyanK

      Year: 2006 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      May 28, 2018

      Good

      Loud, but I’ve heard louder in other exhaust that are on this website

      EfrenP

      Year: 2005 Submodel: GT

      Helpful (1)

    • 3/5

      Installation Time: Afternoon

      May 26, 2018

      No new band clamps

      This catback system sounds amazing on the highway there is no drone and when you're in a tunnel is Scream. Insulation took a little longer than it should have took us about 2 hours to complete with a lift. The kit does not come with band clamps so you can connect this to your H pipe or x pipe so if yours are rusted like mine you'll need to buy new ones also the hangers were not bent properly and the exhaust system seems to be about 2 in too short it would not reach the stock H pipe had to go to the shop and extend my H pipe. Great system but not without its installation flaws. At the price for any of the exhaust systems they should be able to throw in two band clamps

      BrandonO

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      May 19, 2018

      From stock to wow

      This exhaust system is amazing. I went from a sock exhaust to this one and it’s just truly amazing!! Loud when you get on it and has a nice rumble at idle. I did a month of looking at systems before I finally decided on this one and you won’t be disappointed if you too decide to get it. Install wasn’t bad. Took 2 hours only because one of the stock exhaust pipes was stuck in the muffler pipe. Other then that it was a breeze. Everything you need to install this system comes with it. I did my install in my garage on jack stands so it’s doable but is a pain, must jack back of car really HIGH!!

      CodyK

      Year: 2005 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      May 18, 2018

      Amazing

      Unbelievable sound. Completely changed my car it is so much fun to drive.

      NicholasD

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      April 26, 2018

      Great buy !

      Everything I expected ! Perfect sound, easy install (with a lift). Sound is very aggressive but not annoying.

      JamesA

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      April 09, 2018

      Roush exhaust

      The product itself is amazing. Nice and loud..I can feel the little extra power that it gives. The directions however are somewhat terrible for installation. if you don't have access to a car lift and only do this on Jack stands I recommend dropping the two bolts that hold the driveline up. Its right at the end of the H-pipe.,the driveline will drop and sit on the H-pipe allowing you plenty of room to wiggle the huge bend in the midpipe over the rear axle..other than that part everything was pretty easy. Fits good sounds great!

      slicknic

      Year: 2007 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 07, 2018

      JUST BUY IT.

      bolted right on in about 30 mins. took about 2 weeks for it to "break in". it has that great rumble that you're looking for as soon as you stomp the throttle yet it's tame when you can drive like a normal person (good luck with that. if you're on the fence... just buy it.

      JacobB

      Year: 2006 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      March 19, 2018

      Unbelievable

      Paired this cat back with the pypes x pipe and let me tell you how amazing it sounds that first start up had me in tears. Don’t let anyone tell you your V6 won’t sound as good as a V8 because I can confidently rev up next to one any day!!

      GrantB

      Year: 2009 Submodel: V6

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      March 14, 2018

      Amazing sound and no drone

      I bought this cat back system after nearly 6 months trying to find the system for me. It has everything I wanted. Great deep tone, very quiet on the inside while cruising but will make everyone around you either hate you or love you when you downshift and floor it. Its hard to know what it truly sounds like inside the cab so I recommend letting someone you trust drive the car while you follow so you can really hear it. Roush did Exactly what they claim, as much noise is put out the back as possible so that there is practically no drone. When you have the Windows up and you are getting up to speed There is a little drone but nothing unbearable like a lot of other systems

      JeffS

      Year: 2006 Submodel: GT

      Helpful (3)

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