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

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  • Item 69110

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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 2.50-inch diameter stainless steel tubing for a durable long life, the Extreme Performance Cat-Back System features two 304 polished stainless steel 4-inch 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

    MPN# 403936

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    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?

      Customer Photos (39) Submit Your Photo

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        Questions & Answers (50)

        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 (6)

        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

        I currently Have this cat back system installed but having trouble finding a long tube header X pipe to go along with this system. Any suggestion on a functional set up.

        Post Your Question
        10 More Questions
        What is the diameter of the resonator? 1 answer
        I was wondering if anyone on the AM staff has this system paired with the bbk catted x pipe the one that bolts up to stock manifolds or shorty headers and if so how does it sound I fear the x pipe would make it too high pitched. 0 answer
        will this PA state inspection? 1 answer
        will this exhaust pass state inspection in PA.? 1 answer
        Will this cat-back system fit with bbk longtubes and a bbk off-road xpipe? 1 answer
        Will this cat back system work with the kooks long tube headers matched with the kooks catted xpipe? 1 answer
        Can this be used with the roush rear valance square tips? 1 answer
        will i still pass emissions test in Chicago Illinois with this system 1 answer
        Will this roush catback paired with longtubes an off-road midpipe take away the drone at 2k rpm. Some stated it has on the roush extreme axle backs. But i dont know about the catback since the mufflers are on the middle. 1 answer
        I have a 2010 Mustang GT. Will this exhaust fit my Mustang ? Is Roush catback exhaust available for 2010 Mustangs or no ? 1 answer

          Customer Reviews (100+) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Loudness / Volume 4.690648 4.7
          • Exhaust Note 4.877698 4.9
          • Fit & Finish 4.669065 4.7
          • Bang For Your Buck 4.690648 4.7



          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            June 22, 2019

            Roush cat-back exhaust system

            Really looks great and sounds really great and very loud!

            Scott

            Year: 2008 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            June 22, 2019

            Roush catback

            Sounds amazing.!! I get lots of attention now from people on the way it sounds.! Definitely makes it sound like a muscle car. Very happy with choice of catback. Install was easy nothing to difficult with the roush. Having the right tools and help made it easier. Got done in about 1 hour and half

            Santos

            Year: 2008 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            June 11, 2019

            Amazing Exhaust!

            I’ve had this exhaust installed for a little over a month now and it is fantastic. It’s a very deep growl with no noticeable drone. Noticeably louder than my stock GT exhaust. The only problem I had was the fit was not perfect and one tip sticks out slightly farther than the tip on the opposite side. It’s not very noticeable unless you’re staring at the exhaust while the car is parked.

            EGelsomino

            Year: 2009 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 31, 2019

            Fantastic Sound

            Changed the whole tone of my RPM band. Sounds great at idle, very aggressive grumble. I get asked all the time if I had a 5.0 swap. Honestly sounds better as it doesn't have the horrible raspy tone of a Coyote. Get this with a decent H-pipe, heads, and the Hot Rod cams, and you'll have the meanest sound out there.

            AstridGT

            Year: 2006 Submodel: GT

            Helpful (0)

          • 5/5

            May 13, 2019

            GT500 purrs like a kitten

            Love the sound and it does not have the "echo chamber" effect that I had on the previous exhaust system. I have Roush shocks and exhaust on my Shelby and I am extremely happy with both.

            Penhawk

            Year: 2009 Submodel: GT500

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            May 09, 2019

            Killer Tone

            Sounds amazing I've watched several exhaust videos and this was the one I decided on sounds so much better in person. No drone just a nice rumble not to loud either. I'm currently running stock manifolds and stock cats... For now A little pricey but we'll worth it.

            MichaelL

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            May 07, 2019

            Roush Extreme

            Love the sound of these with my O/R H and Ford Racing headers.

            CaliPony

            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 25, 2019

            Awesome exhaust!!

            Delivery was fast got it in like 4 days. Exhaust fits, looks, and sounds great! And easy install.

            Juice

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            March 17, 2019

            Awesome Sound

            I was a bit nervous about the exhaust note being too loud. As I finished the install and fired it up, all of the hobby shop guys complimented on the sound. It isn’t over-the-top on loudness, but it is loud and harmonious. The drone is subtle and quite frankly sounds and feels good. The appearance is killer and extremely easy to install. Don’t waist money in having a shop install for you. The supplied instructions are extremely straight forward.

            AlexZ

            Year: 2005 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Less than 1 Hour

            February 26, 2019

            Cat Back Attack

            Awesome mod for my 2006 gt. Great sound with low cabin rumble. Easy installation.

            BillH

            Year: 2006 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 24, 2019

            love the song it sings.

            just a great fit and finish with of course the Roush quality that comes with them . sounds freaking amazing and with the Bama tune along with the Ford motorsport C A Intake , it hits much quicker pulls harder and sounds so sweet.

            RussellM

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 12, 2019

            Perfect sound

            I personally found that it was very easy to install and line up with the bumper if you hold it in place while tightening it at the axle and at the midpipe. No interior drone and a deep sound out the rear plus some crackle when you rev it because of the resonators.

            RyanZ

            Year: 2008 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            December 22, 2018

            Great product.

            Paired with BBK catted h pipe, this thing screams muscle. Great sound. A little bit of drone, but not so much as to irritate you.

            ThomasP

            Year: 2006 Submodel: GT

            Helpful (2)

          • 5/5

            December 14, 2018

            Amazing Sound!

            My '08 GT/CS had the old quiet stock exhaust. It bugged me since I purchased it and this exhaust was the #1 upgrade I wanted to make. The second I fired her up after the install I was blown away! Car sounds absolutely amazing! Not too loud and obnoxious but love the sound when you put the pedal down and tone is awesome. Pretty easy install except for my old front H-pipe clamps being tough to remove and reuse. Otherwise done in an hour and couldn't be more pleased!

            TeronE

            Year: 2008 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            December 07, 2018

            One Of The Best Parts Of My Day

            This exhaust system is phenomenal! Each individual loves a certain sound, but if you want that old school, muscle car growl, this is the exhaust you want. It has a deep rumble when idleing, but open it up and it really comes alive. Cabin sound is very minimal once your mustang warms up, but the tone is great from startup to shutdown. I could not be more satified with the exhaust, especially considering the fitment was perfect. If you’re hesitating on picking a exhaust, know that you won’t be disappointed with this one.

            MattD

            Year: 2006 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            December 06, 2018

            Sounds amazing

            This thing sounds amazing. Install on Jack stands was a bit tricky. We did not have enough ground clearance to get the pipes over the axel, so we took out the rear springs and it slid right in. It took us about 3 hours to install start to finish.

            MichaelC

            Year: 2007 Submodel: GT

            Helpful (2)

          • 5/5

            September 20, 2018

            Love it!

            Love the sound and the boost! The rumble is the perfect sound and it has a nice chrome look

            DebraL

            Year: 2008 Submodel: GT

            Helpful (5)

          • 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 (6)

          • 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 (4)

          • 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 (4)

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