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

Item 100515
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      Review & Installation Video

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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


      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 -


      Customer Reviews (6)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 6 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • January 01, 2018

        5 2007 GT - Sergio Installation Time: Afternoon

        Deep and throaty

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

        Helpful (6)
      • December 03, 2016

        4 2008 GT500 - Gordonbizkit Installation Time: Afternoon

        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.

        Helpful (8)
      • July 28, 2015

        5 2009 GT - Segs1177 Installation Time: Afternoon

        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.

        Helpful (7)
      • June 19, 2015

        5 2008 GT - Chops1985 Installation Time: Shop Install Installation Cost: $100-$250

        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.

        Helpful (7)
      • May 14, 2015

        5 2007 GT - CMcNam Installation Time: Afternoon

        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!

        Helpful (7)
      • December 04, 2013

        4 2007 GT - JaredMoon Installation Time: Afternoon

        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.

        Helpful (10)

      Questions & Answers (4 answers)

      4 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)

      Is there a drone with this system when paired with long tubes and race cats, and if so, how bad is it?

      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Right muffler assembly
      • (1) Left muffler assembly
      • (1) Right tailpipe assembly
      • (1) Left tailpipe assembly

      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 MufflerFitment:2005-2009 GT, Bullitt
      2007-2009 Shelby GT500

      Will It Fit My Mustang

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

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