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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.

    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

    CA Residents: Warning: California's Proposition 65

    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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    Questions & Answers (38)

    5 Top Rated Questions

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

    • 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.

    Helpful (4)

    Would it fit my v6?

    • 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 (2) Show 1 more answer

    Will this system pass California Smog inspection?

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

    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?

    • 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 (1) Show 2 more answers

    Can this fit a 2010 gt ?

    • Unfortunately this exhaust kit will not fit a 2010 GT due to the changes made to the 2010 model year. With that being said, we do offer a Roush extreme axle-back exhaust kit for the 2010 GT models which can be found here: https://www.americanmuscle.com/roush-extreme-axleback-0509.html.

    Helpful (0)
    Post Your Question
    10 More Questions
    Will this fit to a Pypes O/H pipe ? 1 answer
    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 1 answer
    Two questions. I own a 2008 V6. I know this will fit with the cut clamp X-pipe. But are there any fitment issues when used with the MAC Prochamber H-pipe? Also, I have noticed with V6 duals the tips of most exhaust stick out from the rear bumper quite a bit. Would that still be the case with the GT500/CS rear bumper on a V6? 1 answer
    I want to know how much power will I be getting I’m either getting the borla ATAK or the Roush extreme exhaust. Which one will add more horse power or torque ? 1 answer
    Will I have to purchase new hardware to install this exhaust, or will I be able to use the factory set up? 1 answer
    Hello!!! Just wondering if this Cat Back system is compatible with the kooks catted xpipe and long tune headers, I want to upgrade my whole exhaust and I heard that Cat Back systems are louder and perform better than axlebacks. 1 answer
    Will it fit a 2010 v6 if I pair it with an X pipe 1 answer
    Will this be able to fit with the Pypes 1-5/8 in. Long Tube Headers w/ Shorty X-Pipe? 1 answer
    Will this fit 05-09 v6? If yes what will I need to do? 1 answer
    Are the hangers a necessity? 1 answer

    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 4.713115 4.7
    • Exhaust Note 4.901639 4.9
    • Fit & Finish 4.647541 4.6
    • Bang For Your Buck 4.704918 4.7



    • 5/5

      Installation Time: Afternoon

      September 09, 2018

      Sound of the gods

      This thing its loud and beautiful, no drone, if you are nice whith the pedal its not scandalous, but if you go pedal to metal its gonna be notorius. Very good quality 2 years and still like News and i live in the beach

      trex0

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 25, 2018

      Amazing sound

      What an amazing sound. It really woke up my car. It was really easy to install, The hardest part was getting the old exhaust out of the hangers. Nothing a long pry bar couldn’t take care of. It is pretty loud and throaty so if that’s the sound you want then get this! It took me an hour and some change after getting it on a lift. 10/10 would buy again.

      JosephB

      Year: 2007 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 24, 2018

      Roush Catback!!!

      If you have a 05 to 09 Mustang Gt and are looking for a Exhaust system. This is it! Man does this thing Growl!! Not to loud! Doesn't sound like a tin exhaust kit lol. Adds a few horses too! I love it

      CoryP

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 04, 2018

      Roush Extreme Catback Exhaust

      I've had this exhaust on my 05 GT Convertible for a month now and I have to say it sounds awesome. I was not sure at the beginning if I should get this exhaust because some of the reviews were saying it was loud. I can honestly say it's not IF you keep your stock manifolds and H-pipe with this exhaust. It's a little loud on cold start up but after the car warms up, it settle's down to a Deep Rumble. My car now sounds like an old muscle car just like I wanted. The sound is intoxicating. If you have a standard transmission like I have, you will enjoy down shifting. It crackles, pops and almost sounds like thunder. I don't even listen to the stereo anymore. This muffler is music to my ears. The more you step on the gas pedal, the louder it sounds. Get it, it's well worth it.

      RolyL

      Year: 2005 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 03, 2018

      Fun fun fun!!

      Made my mustang fun to drive again!!! So happy with the purchased!!! Can hear the growl and i smile every time i step on the gas pedal!!!!

      ChristianD

      Year: 2005 Submodel: GT

      Helpful (1)

    • 3/5

      Installation Time: Less than 1 Hour

      July 31, 2018

      Roush Extreme cat back

      Only complaint is the fit of the exhaust. One side was perfect but couldn't get the LS to line up properly in the cut out of the bumper,like the tip needed to be cut off and turned.

      PeterB

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 31, 2018

      Awesome Exhaust

      After doing some homework on what type of exhaust I wanted on my 2009 Mustang GT, I decided Roush. I ABSOLUTELY LOVE IT! It's loud but not overbearing!!!

      LaraineB

      Year: 2009 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 25, 2018

      PERFECT

      SOUNDS GREAT! Not overpowering loud for those in a local area but def turns heads.

      DwayneW

      Year: 2005 Submodel: GT

      Helpful (0)

    • 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.

      JaidenB

      Year: 2005 Submodel: GT

      Helpful (2)

    • 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 (2)

    • 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 (4)

    • 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 (2)

    • 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 (2)

    • 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 (3)

    • 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 (3)

    • 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 (6)

    • 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 (2)

    • 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 (5)

    • 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 (2)

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