Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily
Win An Eibach Sportline Kit! Enter Daily

Kooks Performance Cat-Back Exhaust (05-09 GT, GT500)

Market Price $986.16 You Save 12% ($113.45)
Our Price


FREE Shipping

  • Item 100515

Will this fit your Vehicle?

Change Vehicle Help?
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & Details

    • Aggressive Muscle Car Exhaust Note
    • 3" Oval Race Mufflers
    • 2.5" Stainless Steel Tubing
    • 4" Polished T304 Stainless Steel Tips
    • Direct Fit Replacement Upgrade
    • Fits 2005-2009 GT, Bullitt and 2007-2009 Shelby GT500 Mustangs

    Review & Installation Video

    Review & Install Video

    Aggressive Exhaust Note. Give your V8 powered Mustang the loud aggressive exhaust note of a classic 60's muscle car with a Kooks Performance Cat-Back Exhaust system, that features oval stainless steel race mufflers.

    Durable Stainless Steel Construction. Constructed from 2.5" diameter stainless steel tubing for strength and corrosion resistance, this Kooks Performance Cat-Back exhaust system features two high flow 3" Oval Race Mufflers that end with 4" polished T304 stainless steel slant cut exhaust tips.

    Application. This Kooks Performance Cat-Back Exhaust Kit is specifically designed to fit the 2005-2009 GT and  Bullitt as well as 2007-2009 Shelby GT500 models. Technical Note. Will

    not work with the following Kooks Mid Pipes 6023-CX-3R, 6023-CX-3R-GREEN, 6023-OX-3R

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# 11304100

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Right muffler assembly
    • (1) Left muffler assembly
    • (1) Right tailpipe assembly
    • (1) Left tailpipe assembly
    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: Race Muffler Fitment: 2005-2009 GT, Bullitt
    2007-2009 Shelby GT500
    Will it fit my Mustang?

      Customer Photos (10) Submit Your Photo

      View All 10 Photos

        Questions & Answers (3)

        3 Top Rated Questions

        Hey, I'm planning on getting this catback system with the Kooks longtube headers and catted x pipe combo for manual 2009 GT. In the description it states it will NOT work with certain Kooks midpipes. Will this setup work, or does the midpipe conflict? Thanks, Cam

        • The Kooks Performance Cat-Back Exhaust will be compatible with the Kooks Long Tube Headers and Kooks Short X pipe for Long tubes.

        Helpful (1)

        Will these work with my stock headers and stock mid-pipe?

        • Yes. They are designed for the OEM connection.

        Helpful (0)

        Kooks Headers Will this work with Kook's long tube headers?

        • Yes.

        Helpful (0)
        Post Your Question

          Customer Reviews (6) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Loudness / Volume 4 4
          • Exhaust Note 5 5
          • Fit & Finish 4 4
          • Bang For Your Buck 4.666667 4.7

          • 5/5

            Installation Time: Afternoon

            January 01, 2018

            Deep and throaty

            “Sounds like a mustang” is what really sums it up now


            Year: 2007 Submodel: GT

            Helpful (6)

          • 4/5

            Installation Time: Afternoon

            December 03, 2016

            Nice sound and quality

            I feel this exhaust has a great sound with stock cats on the car. If I had a off road h pipe or high flow cats it be to loud for my taste. Car runs great, quality is awesome, I wish they had made the hangers on the mufflers longer it's very tough to get them away from the bumper cut outs because they are so short. I bent the driver side to get some more clearance.


            Year: 2008 Submodel: GT500

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            July 28, 2015

            Worth The Money

            The exhaust note is perfect. Not too loud at idle, but sounds great when under load. There is a little drone when cruising around 1,900-2,000 RPM, but once you get past that, it goes away. Not that I mind it, but passengers might get annoyed after awhile. Installation was a breeze. Right side fit perfect right out of the box. The left side had to be adjusted and bent the hanger bars to get the right fit. Might have just been the factory brackets as well. All in all, the sound is exactly what I was looking for and worth every penny.


            Year: 2009 Submodel: GT Fenton, MI

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            June 19, 2015

            Perfect Exhaust Note But Kinda Pricey

            This system is awesome sounding, exactly what I was looking for: louder, deeper and a bit throaty but w/o excessive rasp, popping and crackling. Fit was perfect (muffler shop said it was a really easy install, $150 btw) but there is some slight drone at 2k, I like it but if you drive an automatic like me, just be aware (and its nothing your shaker stereo can't drown out anyway). If you've got the means, I highly recommend but if you need to save cash, try the Ford Racing 500 Stingers for a similar sound from what I've heard online.


            Year: 2008 Submodel: GT California

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            May 14, 2015

            Excellent Quality

            I bought the Kooks exhaust after being disappointed with another company's product. I read multiple reviews about Kooks and was confident I would not be disappointed again, and I was right! The first thing I noticed was that the welds are spot on. This system was obviously made by professionals who take great pride in their product. Every part of this exhaust, from the pipes to the clamps is fantastic. Install is easy (even someone who has no experience with cars can do it), though it helps to have another person who can help you line it up properly. Finally, the exhaust note is perfect. It is quite loud and burbly. It really has a nice muscle car snarl, especially when you go wide open. I have received multiple compliments (from the neighbors even!) and would not hesitate to recommend Kooks over any other brands!


            Year: 2007 Submodel: GT MA

            Helpful (7)

          • 4/5

            Installation Time: Afternoon

            December 04, 2013

            Great Note

            First and foremost the exhaust note is amazing. I have an entire Kooks exhaust system (Kooks Long Tubes, Kooks Catted X-Pipe, Kooks Catback System picture above) The car isn't as harsh as my previous exhaust as it is more of a 'purr' which sounds amazing. My only complaint is the packaging oddly enough which mixed and matched the 'left' and 'right' labels on the piping which made it a little confusing to workout. Additionally, 'left' and 'right' is not a specific enough side labeling technique on a car, use 'passenger' and 'driver.' Regardless, the exhaust note is perfect. Great work Kooks, you never disappoint.


            Year: 2007 Submodel: GT USA

            Helpful (10)

          Related Mustang Categories