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Magnaflow 3 in. Competition Series Cat-Back Exhaust (05-09 GT, GT500)

Item 388826
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      Product Information

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


      • Aggressive Muscle Car Sound
      • Competition Series Bullet Style Mufflers
      • Stainless Steel Construction
      • 3-Inch Diameter Mandrel-Bent Tubing
      • 4-Inch Diameter Polished Stainless Steel Tips
      • Fits 2005-2009 GT, Bullitt And GT500 Mustangs


      More Power. Stop choking off your V8 powered Mustang with the restrictive stock exhaust system and enjoy more power by installing a Magnaflow 3 Inch Competition Cat-Back. A Magnaflow 3-Inch Competition Cat-Back will eliminate power robbing restrictions for a measured increase in horsepower and torque at the rear wheels of your GT, Bullitt or Shelby GT500.

      Aggressive Muscle Car Sound. Give your V8 powered 2005-2009 Mustang the aggressive rumble it deserves with a Magnaflow Competition Cat-Back. This premium quality exhaust features free-flowing, straight-through bullet style mufflers that increase power and give your Pony an unmistakable muscle car sound.

      Magnaflow Quality. Constructed from durable 3-inch diameter mandrel bent stainless steel tubing for it's corrosion resistant properties, this Magnaflow Cat-Back features 2 straight-through Competition mufflers with brightly polished 4-inch stainless tips, that exit in the stock locations for impressive muscle car looks and sound.

      Application. This Magnaflow 3 Inch Competition Cat-Back Exhaust System is specifically designed to fit 2005 to 2009 GT, Bullitt and Shelby GT500 Mustang models with a Magnaflow or aftermarket 3-inch Mid Pipe installed.

      Note: Coupon codes cannot be applied to this product.

      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# 16674

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (3)

      Write a Review

      Ratings Summary

      4.3 out of 5 overall rating from 3 customers

      Installation Time: Weekend

      Installation Cost: $100-$250

      • June 20, 2018

        4 2009 GT500 - kaznah Installation Time: Afternoon


        I bought Magnaflow exhaust because of the tone. I am not disappointed. I also bought it because it is generally quiet unless you're on the pedal. Again, not disappointed. It isn't as quiet as I anticipated, but, I'm getting old! Ha. It is an awesome system that is expensive, but will withstand the test of time.

        Helpful (7)
      • June 24, 2017

        5 2008 GT - ScottF

        Completes the package

        I have a fairly heavily modified GT, cold air, TB, intake manifold, cams, long tubes with a 3 inch H pipe. But stock 2 1/2 inch over axle pipes and some axle backs. I really didn't like some of the sounds it was making in the low RPMs. These pipes changed all that! Gave me a nice consistent deep growl, I love it! Really lets her flow and completes the package. The guys at the shop said they went in nice and the instal only cost me a 137 bucks. I would recommend this set up to anyone with a 3 inch H pipe. Oh, and AM had it to me in 3 days!

        Helpful (10)
      • January 15, 2016

        4 2006 GT - Jamie Installation Time: Shop Install Installation Cost: $100-$250


        Exhaust sounds GREAT! Love the look of the 4 inch stainless steel tips. If you are looking for a deeper rumble sound for your mustang then this is the right exhaust to get!

        Helpful (10)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      Is this 3 in inner or outer?

      • This exhaust will be 3 inches in diameter for most pipes.

      Helpful (0)

      What is the differences or comparisons of this Competition Exhaust and the Magnaflow Magnapak Exhaust?

      • Magnaflow recently replaced/renamed the Magnapack lineup as the competition lineup.

      Helpful (0)

      Do I need an adapter to install this on the stock system? Or do I need the whole system?

      • This Magnaflow 3 Inch Competition Cat-Back Exhaust System is specifically designed to fit 2005 to 2009 GT, Bullitt and Shelby GT500 Mustang models with a Magnaflow or aftermarket 3-inch Mid Pipe installed. Minor modification and an adapter will be required to use this exhaust system on your factory Mid Pipe.

      Helpful (0)

      Since y'alls description is fairly vague at best. Is this setup for a single inlet? Cars turboed so I need something that is single in dual out..

      • The Magnaflow Competition Cat-Back Exhaust is comprised of two completely separate pipes. So this cat-back is dual in/dual out.

      Helpful (0)

      the kit explains is intended to bolt to a 3"midpipe. so does this mean any midpipe that is 3" not magnaflow specific? will it bolt with the kooks 3" catted x pipe?

      • The Magnaflow Competition Cat-Back Exhaust - 3in. (05-09 GT, GT500) does not need to bolt up to a Magnaflow specific midpipe. As long as the midpipe you want to use has a pipe size of 3" you can bolt the The Magnaflow Competition Cat-Back Exhaust up to it.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Competition Muffler Assemblies
      • (2) Over Axle Tail Pipes
      • (2) Clamps

      Tech Specs

      Cat-Back Exhaust Specifications
      Piping Material:Stainless Steel Tip Material :Polished Stainless Steel
      Piping Size:3"Tip Size:4"
      Muffler Type:Straight-throughFitment:2005-2009 GT, Bullitt, GT500

      Will It Fit My Mustang

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

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