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Flowmaster American Thunder Cat-Back Dual Dump Exhaust - Stainless Steel (86-98 GT, Cobra)

11 Reviews
Our Price

$350.97

  • Item #18431
  • MPN# 817574

  • Market Price $396.60
  • You Save 12% ($45.63)
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Product Videos Customer Photos
Features
  • Aggressive Flowmaster Sound
  • Dual Dump Exhaust
  • Super 44 Series Mufflers
  • Mandrel-Bent Tubing
  • 409 Stainless Steel Construction
  • Fits 1986-1998 GT and Cobra Mustangs
Description
Flowmaster Sound. The Flowmaster American Thunder Cat-Back Dual Dump exhaust system with its mandrel bent tubing will improve your Mustangs exhaust flow for an increase in power, and the included Super 44 Series Mufflers will give your Pony a deep throaty muscle car exhaust sound.

Dual Dump Exit. This Flowmaster American Thunder Cat-Back system features a Dual Dump design that exits the exhaust in front of the rear wheels for a stealthy appearance.

Stainless Steel Construction. Constructed from mandrel bent 2.5" diameter 16 gauge stainless steel tubing for it's corrosion resistant properties the Flowmaster American Thunder catback features Super 44 Series chambered mufflers for that classic muscle car sound.

Application. This Flowmaster American Thunder Stainless Steel Cat-Back Dual Dump exhaust system is specifically designed to fit the 1986 to 1998 5.0 LX, GT and SVT Cobra Mustangs.

Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Details

What's in the Box
  • (1) Left muffler assembly
  • (1) Right muffler assembly
  • (2) Turn down pipes
  • (2) Clamps
  • (2) Hanger keepers
Installation Info
Tech Specs
Cat-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : N/A
Piping Size: 2.5" Tip Size: N/A
Muffler Type: Chambered Fitment: 1986-98 GT and SVT Cobra Mustangs
Will it fit my Mustang?
  • Cobra - 94, 95, 96, 97, 98
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • GT - 94, 95, 96, 97, 98

Most Helpful Reviews

5/5
Great sounding mufflers!

Installed these along with the Pypes off-road x-pipe and I am extremely satisfied. Bolted right up in place with no install problems. Only problem with turndown tips is ground clearance, but my car is ...

Read More
Helpful (2)

5/5
Easy install, great product!

Another great product from flowmaster! Bolted up perfectly to my BBK xpipe, and has an awesome aggressive sound! It is a little louder inside the car, but not too bad. Don't miss the tail pipes, and love ...

Read More
Helpful (1)

Read All 11 Reviews
Overall Rating 4.8 out of 5 stars

Video

Hey, Justin here with AmericanMuscle.com, breaking down Flowmaster’s American Thunder Cat-Back Dual Dump exhaust fitting the 86-98 GT and Cobra. Obviously the big difference between this system and other exhausts is the way it exits, as you can see there are no real tail pipes. Instead, everything flows with these super 44 series mufflers, through the turn downs and then dumps right out underneath the car right in front of the rear axle. So why would you want to do this? Well, some would say it gives the rear of the car a different, some might even say cleaner look by deleting those tail pipes altogether, there’s no real difference in performance to speak of, although it might be slightly louder inside the cabin versus your standard tail pipe. As for the system itself, we’re looking at a full 409 grade stainless steel construction throughout, and what little piping there is has all been mandrel bent. That iconic Flowmaster sound comes courtesy of Flowmaster’s twin super 44 series mufflers which Flowmaster claims is one of the most aggressive mufflers they offer in terms of overall sound. Because Ford chose to weld the factory exhaust on the Fox bodies and the SN95’s, you will need to cut it off with a sawzall or something similar before getting started with the install. Once you get that out of the way, getting the new Flowmaster bolted up is a pretty straightforward task that should only take you about 2 hours from start to finish. Now let’s hear how Flowmaster’s dual dump American Thunder sounds compared to our factory exhaust.

Customer Photos (2) View All Photos

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5 Questions / 7 Answers

Ask a Question

Turn down vs tail pipes Is there a HP diff with the turn downs vs full lenght tail pipes on a 97 GT?

miami01

  • I don't think there is a hp difference, just preference in look. I didn't notice a difference in hp in my 98 cobra in regards to tail pipes or dumps.

    Pat98

    Good Answer (0) (0)

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Loudness On a scale outta 1-10, 10 being the loudest. How loud would a 95 GT with a full length BBK Catted X and these dumps? I think with these dumps and the catted x it should be pretty loud and mean right?

going2ownastangsoon

  • 10, mine are louder then Boral stingers with no cats, inside vibrations are extremely high. The dumps echo off the street so the sound is amplified and deep. Its really mean sounding, and at WOT sounds amazing!!!

    OKid

    Good Answer (1) (0)

Show 2 more answers Question Resolved

Fitment? I just took these off my totaled 1996 Cobra and wanted to know if it would fit on a 2003 Cobra?

Joshdaboss1994

  • No the exauhst hangers are different

    Dmcj

    Good Answer (0) (0)

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Customer Reviews (11) Write a Review

Overall Rating 4.8

out of 5 stars




  • 5/5

    Installation Time: Afternoon

    August 08, 2012

    Great sounding mufflers!

    Installed these along with the Pypes off-road x-pipe and I am extremely satisfied. Bolted right up in place with no install problems. Only problem with turndown tips is ground clearance, but my car is also lowered a bit. My 96 GT rumbles nice And loud when I'm idling and driving. Head turner!

    Legend

    Year: 1996 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 Honolulu, HI, USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 23, 2016

    97 mustang gt

    Love the sound of it ! It gives it a deep sound ! Very easy to install! Very happy with them!

    Beg

    Year: 1997 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    January 14, 2016

    Perfect exhaust for a big tire car!

    Bought this setup because the 315's on my 95 GT rubbed the tailpipes. Only problem I ran into was the bracket in the drive shaft tunnel that holds the brake line rubbed the passenger side pipe between the muffler and the end of my H pipe. I trimmed that bracket a little and no more rubbing. As far as sound I have factory exhaust manifolds with aftermarket H pipe with high flow cats and it's actually quieter going down the road than the exhaust I took off which surprised me. Only time I get the high interior drone sound is between 1000-1800 rpm's. Going down the highway in 5th gear and stock gears and it's nice and mellow. Low RPM's is where all the noise is. Exhaust note is great, definitely recommend!!

    Luckstone

    Year: 1995 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 5+ Mebane, NC

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    December 23, 2014

    Driveway Install.

    The Flowmaster American Thunder Catback Dual Dump exhaust system looks and sounds great. I was able to install the system in my driveway in one afternoon. The bolt hole alignment was a bit off and took awhile to get it just right to be able to install. Overall this system looks great and sounds even better, I could not be happier.

    Glenn76

    Year: 1994 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Prescott, AZ, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    December 18, 2014

    easy install sounds great

    this was the easiest install i have ever done . and it sounds great

    92stang

    Year: 1992 Model: Other Driving Style: Show 'Stangs I have owned: 5+ Philadelphia, PA, USA

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    December 21, 2013

    flowmasta dumps

    Very cheap product and great bang for the buck. Have this mated to longtube headers and an x pipe and the sound is just mean. I recommend

    Dmcj

    Year: 1995 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 bay area

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    August 28, 2013

    Pretty mean sound !!!

    These flowmasters were easy to install very simple. I like them they really sound great n loud the only thing is that in the inside of the car is it rattles everything but I don't mind . I have em on bbk short headers n a bbk x pipe fits perfect .

    Juanjuanh

    Year: 1994 Model: Cobra Driving Style: Daily Driver 'Stangs I have owned: 2 Crane, TX 79731, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 03, 2013

    Easy install, great product!

    Another great product from flowmaster! Bolted up perfectly to my BBK xpipe, and has an awesome aggressive sound! It is a little louder inside the car, but not too bad. Don't miss the tail pipes, and love the cleaner look! I recommend this product! THANKS AM!

    Pat98

    Year: 1998 Model: Cobra Driving Style: Street / Strip 'Stangs I have owned: 2 Illinois, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 15, 2012

    AWESOME SOUND! EASY INSTALL!

    I actually didn't purchase this exhaust off of American Muscle, because they just started selling recently, but I just did the install today. I installed it with the BBK O/R H-Pipe and it sounds absolutely amazing! Bolts right on, nice and easy. I had no issues whatsoever. I replaced my old hanger with new ones during the install, and I installed the new H-Pipe at the same time. This setup that I am running has an amazing increase in throttle response and overall horsepower. If you are afraid that you won't gain enough, let this be your reassurance. I absolutely love the way they sound.

    TBang

    Year: 1994 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Topeka, KS, USA

    Helpful (2) (1)

  • 5/5

    Installation Time: Afternoon

    August 15, 2015

    Very Nice Exhaust for A Good Price

    The install went great with out any problems, The only hiccup is that the holes leading to the x pipe are a little small buy we just filed out the holes and it fit perfectly. Also its a nice deep muscle car sound low growl with my catted h-pipe.

    Steven

    Year: 1998 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Orefield, PA

    Helpful (0) (1)

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