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Flowmaster American Thunder Cat-Back Exhaust (99-04 GT, Mach 1)

Item 18410
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      Video Review & Installation

      Hi I’m Justin with AmericanMuscle.com, and I’m breaking down Flowmaster’s American thunder Cat-Back exhaust fitting the 99-04 Mustang GT and Mach 1. A few of the big points with this catback are the 2.5” aluminized steel mandrel bent tubing, the 3” brightly polished OE style tips, and finally and most importantly, Flowmaster’s super 40 series mufflers which give this kit its very aggressive and unique sound. Flowmaster does offer a full stainless version of this same exact exhaust, which will be slightly lighter and better at resisting corrosion, however it does come with a slightly higher price tag. Due to the design of the factory exhaust you will need to cut it off in sections using a saw or something similar. Once you get that out of the way, the American Thunder bolts directly to your factory Mid Pipe, in about 2 hours using some basic hand tools and the included clamps. Now let’s hear how Flowmaster’s American Thunder sounds compared to our factory exhaust.

      Product Information

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

      Features

      • Aggressive Flowmaster Sound.
      • Super 40 Series Mufflers.
      • 3" Polished Stainless Steel Tips.
      • Mandrel-Bent Tubing.
      • Durable Aluminized Steel Construction.
      • Fits 1999-2004 GT, Mach 1, and Bullitt Mustangs.

      Description

      Flowmaster Sound.The Flowmaster American Thunder Cat-Back exhaust system with its mandrel bent tubing will greatly improve your 1999 to 2004 Mustangs exhaust flow for an increase in power, and their included Super 40 Series Mufflers will improve your exhausts sound for a deeper throatier muscle car exhaust note.

      Quality Construction. Constructed from mandrel bent 2.5" 16 gauge aluminized steel tubing for it's corrosion resistant properties the Flowmaster American Thunder Cat-Back features their Super 40 Series chambered mufflers with 3.0 " diameter OEM style polished stainless steel tips for great muscle car looks and sound.

      Fitment. This Flowmaster American Thunder Cat-Back exhaust system is specifically designed to fit the 1999-2004 GT, 2001 Bullitt, and 2003-2004 Mach 1 Mustangs for both impressive looks and sound. This system will not fit the SVT Cobra Mustangs.

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      Flowmaster 17312

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

      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
      • (2) Clamps
      • (4) Lock Washers

      Tech Specs

      Cat-Back Exhaust Specifications
      Piping Material: Aluminized Steel Tip Material : Polished Stainless Steel
      Piping Size: 2.5" Tip Size: 3.0"
      Muffler Type: Chambered Fitment: 1999-2004 GT, Bullitt and Mach 1 Mustangs
      4.7

      Customer Reviews (100+)

        Reviews of Flowmaster Exhaust products have an average rating of 4.7 out of 5

          Questions & Answers

          10 More Questions

          Will It Fit My Mustang

          • Bullitt - 01
          • GT - 99, 00, 01, 02, 03, 04
          • Mach 1 - 03, 04

          Fits GT, Mach 1, and Bullitt

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