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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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$624.99

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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?
    • Bullitt - 08, 09
    • GT - 05, 06, 07, 08, 09
    • GT500 - 07, 08, 09

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    34 Questions / 9 Answers

    Ask a Question

    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)

    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)

    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 (1)

    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 ?

    AlexisZ

    • The Roush Extreme Performance Cat-Back System will add some minor horsepower. You will not see significant gains from just installing a cat-back.

      AshleyK

    Helpful (0)

    Will I have to purchase new hardware to install this exhaust, or will I be able to use the factory set up?

    JamesW

    • The Roush Extreme Performance Cat-Back System will use the two supplied clamps as well as the factory clamps. We do recommend getting the SR Performance Stainless Steel Exhaust Hanger Kit, item # 20021, (https://www.americanmuscle.com/pypes-2005-stainless-hangers.html) for 2005+ Mustangs to provide more strength, stability and a cleaner appearance.

      AshleyK

    Helpful (0)

    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.

    Victor

    • The Roush Extreme Performance Cat-Back System will bolt up to the Kooks Catted X-Pipe. If you go with the Kooks mid-pipe, you will need to purchase Kooks long tube headers.

      AshleyK

    Helpful (0)

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    Customer Reviews (96) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.692307 4.7
    • Exhaust Note 4.868132 4.9
    • Fit & Finish 4.725275 4.7
    • Bang For Your Buck 4.703297 4.7



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      February 19, 2018

      Roush Extreme Catback Exhaust System

      I love the Roush Extreme Catback exhaust system. It's sounds incredible with that deep growl. It's way better than the SLP Loudmouth axlebacks I had previously on my car. Thanks American Muscle!

      CarlK

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      February 11, 2018

      Awesome Exhaust!!!

      Like my title says, this exhaust is awesome! And best of all my neighbors love it too! I wake them up every morning at 6:00 am just in time for them to go to work too! Great deep tone and easy to install.

      Jeff

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      January 12, 2018

      Let's get ready to ruuumble.

      Great deep sound with long tubes and after market H pipe.Almost seemed to loud at first but you'll get used to it.If you don't get along with your neighbors this will probably push them over the edge. Awesome nascar sound.

      ChrisC

      Year: 2006 Submodel: GT

      Helpful (0)

    • 2/5

      Installation Time: Less than 1 Hour

      January 09, 2018

      NOT loud

      Definitely not as loud as the loud meter has it to be. Was pretty disappointed.

      DavidQ

      Year: 2007 Submodel: GT

      Helpful (0)

    • 3/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      December 31, 2017

      Fitment was my only issue

      I have a 2006 stage one roush with the roush bumper and valence. I was told that if i buy the square tips and weld them on the kit will work for me, it did not and the shop ending up fabbing their own pipes to make it work, so if you have the roush rear valence be aware, this kit will not line up, but it can be done, otherwise i love the exhaust

      MattyIce

      Year: 2006 Submodel: Other

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      December 29, 2017

      Lound and great

      It was a annoyingto put in place, we (my friends and I) had to use 2 REALLY high jack's to get the car high enough to put in the pipes other than that everything is amazing!

      EricY

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      December 08, 2017

      Beastly sound

      Very good exhaust, easy installation for anyone with common car knowledge. Sounds much better with very limited drone.

      James

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      December 06, 2017

      Sounds Mean

      I chose the Roush and couldn't be happier! This exhaust will turn head because its very loud. It has a deep sound and will wake neighbors when you let her rip. It has like 6 bolts for the whole exhaust so not bad for an install.

      Jp1980

      Year: 2008 Submodel: GT

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      December 04, 2017

      Roars like nothing else

      This thing is loud. I scared a pedestrian when driving around. There's no drone in lower rpms. which is nice and it's also pretty quiet while idling. But every time you accelerate it just screams. It's tough to get through my neighborhood with this thing but if you're gentle with the gas pedal it's relatively quiet

      StevenR

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      December 02, 2017

      sounds great

      They sound great. Not too loud when you want to creep around and really roars when you give it some gas. No drone so far, and now the sound in the cabin is much quieter; I can carry a conversation at a normal speaking volume. Note- If you don't have a lift you might have to get it installed at a shop. I couldn't get my car high enough off the ground to put the pipes over the axle.

      Cory

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      December 01, 2017

      Best bang for the buck

      Well I did get this as a Black Friday deal sonit was by far the best bang for the buck. Love the sound of it. Very nice at highway speeds. It’s not deafening while cruising at 75-80mph. It really comes alive when you get on it. I’m don’t think the neighbors will like it when I️ get home from work at 4am but oh well. As for install, very simple. If you only have jack stands as i did, you will need to drop the rear axle down. I did one side at a time, you will have to disconnect the seat bar, end link and lower shock. Let the axle hang down and you can take out the factory mid pipe and install the new one very easily. Total install took about 2 hours, they don’t have an option for 2 hours in the drop down menu on this review so I put afternoon. I got the car up as high as i could on 4 jack stands. Love the look of the exhaust tips. I’m usually not a chrome type of person but they do look nice. My car is an 08 GT500, I wish they had an option to say GT500 on the tips instead of Roush but it’s all good.

      Brian

      Year: 2008 Submodel: GT500

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      November 15, 2017

      If this ain't it, there's no it to get

      The Roush Extreme cat-back is the best sounding exhaust system on the planet. A little rumble inside the car with the windows up but nothing to get bothered about. Now, roll down the windows and it's pure heaven.

      LarryC

      Year: 2008 Submodel: GT

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      October 20, 2017

      Not for everyone

      If you are looking for a moderate exhaust note this is not the set for you. They are loud and obnoxious, just what I was looking for. Would not put on my daily but love them on the Shelby. Quality is typical for Roush, all top notch.

      dsjr70

      Year: 2009 Submodel: GT500

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      October 19, 2017

      Rouch cat back

      Excellent sound and easy install. A hoist is needed to do it right but otherwise simple tools and easy

      DonnieM

      Year: 2008 Submodel: GT500

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      October 08, 2017

      great sound

      these sound great, you will not be disappointed. Keep under 2000rpm and the neighbors wont complain.

      NickQ

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      October 05, 2017

      ROUSH EXTREME CAT-BACK EXHAUST

      Exactly what I was looking for... Car sounds great.

      RichardE

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      September 28, 2017

      Great Exhaust

      This exhaust went on a 2008 Shelby GT500. Loud exhaust without typical drone. Fit and finish is very good. Used a lift to install and only took about 2-3 hours. This exhaust would be difficult to install using only jack stands, but that is no different than any other exhaust job. The sound is great. Idle is not much louder than stock, but really sounds great once the RPM's get up.

      DavidS

      Year: 2008 Submodel: GT500

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      September 26, 2017

      Over all satisfied

      Makes the 4.6 sounds like a beast. Waiting to hear this setup with BBK long tube headers and BBK catted X pipe.

      GSavage

      Year: 2007 Submodel: GT

      Helpful (0)

    • 3/5

      Installation Time: Less than 1 Hour

      August 31, 2017

      Know that this exhaust has no mufflers

      Some people love this exhaust, me personally I purchased it because my friend was telling that cat backs are way better than axle backs and not knowing much about exhaust I didn't realize this exhaust had no mufflers, so the sound it extremely raspy, if that's what you into then this is the one for you, but me I would of went with the axle back roush since that one has mufflers and would produce a different sound

      CardielV

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 11, 2017

      A better sounding 4.6

      Installed on my 2006 GT Convertible and the exhaust note is fantastic. I put my car up on jackstands as high as I could and the drivers side went on pretty easy. The passenger side I couldn't get the mid pipe over the axle. I took it to a local shop, put it on their lift and got in on in about 15 minutes. It's not as loud as I thought it would be but that's probably a good thing because any louder would probably get me in trouble with my heavy foot. Loud when I'm getting on it, quiet when I'm cruising (no drone). Well worth the money.

      DougS

      Year: 2006 Submodel: GT

      Helpful (0)

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