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Flowmaster American Thunder Classic Axle-Back Exhaust (05-10 GT, GT500)

29 Reviews
Our Price

$512.15

  • Item #18417
  • MPN #817460
  • Market Price $569.06
  • You Save 10% ($56.91)
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Product Videos Customer Photos
Features
  • Aggressive Flowmaster Classic 40 Series Sound
  • Polished stainless steel 4" tips
  • Durable Stainless Steel Construction
  • Includes two Flowmaster mufflers
  • Fits 2005-2010 GT, Bullitt and Shelby GT500
Description
Classic Flowmaster Sound. Give your Mustang that unmistakeable Flowmaster sound with a nice power boost with the American Thunder Axle-Back exhaust system. This system improves exhaust flow using Flowmaster's patented chambered muffler design for that throaty, aggressive exhaust tone your high powered Pony deserves. Quality Construction. Constructed from durable 2.5" 16 gauge stainless steel tubing for its resistance to corrosion, the Flowmaster axle back features two special chambered Classic 40 Series Flowmaster mufflers with 4" diameter polished stainless steel tips for muscle car looks and sound. As an added bonus the tip is embossed with the "Flowmaster" logo for true custom styling.

Application. This Flowmaster American Thunder Axle-Back exhaust system is designed to fit the 2005-2010 Mustangs including the GT, Bullitt and Shelby GT500 for both great looks and great sound.

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. Click here for details.

Mustang Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (2) Muffler assemblies
  • (2) Clamps
Installation Info
Tech Specs
Axleback Exhaust Specifications
Piping Material: Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 2.5" Tip Size: 4"
Muffler Type: Chambered Fitment: 2005-2010 GT, Bullitt & GT500
Fitment
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

Most Helpful Reviews View All

Overall Rating 4.6/5 Write a Review
5/5
Nice upgrade.

I thought long and hard before deciding on purchasing the AT Classics. I read numerous reviews and watched every video I could find online. I can say I am happy with my choice. It took less two hours to

Read More
Helpful (8) (0)

5/5
Deep Vibrating Baratone Bass... Mean!

You won't go wrong with these Mufflers. The Fit and Install was perfect. And the Sound!!!! Deep, Vibrating Bass that will Move You and those around You. What are you waiting for? Buy these! They're G

Read More
Helpful (3) (0)

Videos

I’m Justin with AmericanMuscle.com and I’m taking a closer look at Flowmaster’s American Thunder Classic Axle-back exhaust for the 2005-2010 Mustang GT. The classic incorporates the tried and true 40 series View Full Transcript

Customer Photos (9) View All

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Q & A (2 Questions, 2 Answers) Ask a Question

exhaust So i have a X pipe daul exhaust on my 2008 v6 and i was wandering if i could put the flow master classic thunder gt mufflers on it?

trouble Year: 2008 Model: V6

Good Question (0) (0)
  • It might take a little hammering and bending but as long as the pipe diameters match up, then you should be fine. You might also have to hang your own brackets for the exhaust hangers though.

    Helpful (0) (0)

    302vs351 Year: 1993 Model: GT

    Top 100 Contributor

Show 1 more answer Answer This Question

How much HP gain will I get with this axle-back exhaust if I already have a BAMA Tune and K&N Air Intake? Also, is this one of the best axle-back exhaust in terms of HP gain?

Wknichols13 Year: 2009 Model: GT

Be the First to Answer This Question
Good Question (0) (0)

Reviews (29) Write a Review

  • 5 Stars .76 76%
  • 4 Stars .14 14%
  • 3 Stars .07 7%
  • 2 Stars 0 0%
  • 1 Stars .03 3%
4.6

out of 5 stars

27 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume: 4.52 4.5/5
  • Exhaust Note: 4.64 4.6/5
  • Fit & Finish: 4.24 4.2/5
  • Bang For Your Buck: 4.32 4.3/5
Filter By Sort By
  • 5/5

    Nice upgrade.

    April 08, 2012

    I thought long and hard before deciding on purchasing the AT Classics. I read numerous reviews and watched every video I could find online. I can say I am happy with my choice. It took less two hours to install in my garage with a jack and a couple of jack stands. The hardest part was removing the stock mufflers and reaching a couple of the anchor point bolts along with aligning the tips. The larger outlets look great. And the sound...whoa the sound. They sound great at startup, deeper and louder that stock what a muscle car should sound like. Inside the volume is definately up compared to stock especally duing low rpm acceleration where I did notice some boom at first. It has lessened to a cleaner tone the more miles I've driven but it is still noticably louder than stock. Steady crusing at highway speeds is about as quiet as stock. I didnt see any mention of a power increase on the AM website. The Flowmaster website does include dyno graphs showing a Hp and torque increase. I have noticed a bit more power or maybe it just sounds faster:)

    TXArt

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Texas

    Helpful (8) (0)

  • 5/5

    Awesome

    April 04, 2012

    Well I didn't buy them from here, got them from amazon. Since I buy a lot from here decided I'd put the review on here. Installation took me about 45 mins mainly because I didn't have the greatest car jack to use. But installation was easy none the less and I'm no mechanic. Bolted up nice and snug just like the stock ones. Sound was completely different. You can definitely hear that distinctive tone when you start it up and sounds amazing going through the gears ( I have an automatic). Sounds simply amazing. I definitely recommend this product. Best bang for your buck!!

    Joe08GT

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Chantilly, VA

    Helpful (3) (0)

  • 5/5

    Deep Vibrating Baratone Bass... Mean!

    March 14, 2012

    You won't go wrong with these Mufflers. The Fit and Install was perfect. And the Sound!!!! Deep, Vibrating Bass that will Move You and those around You. What are you waiting for? Buy these! They're Great!

    DRick

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Central Jersey

    Helpful (3) (0)

  • 5/5

    Easy Install=Amazing upgrade!

    February 06, 2012

    I was prepared for this installation to take at least 2 hours. With the help of a friend, we were able to give my mustang a new rumble in about 45 minutes. Neither of use had dealt with exhaust installation prior to this evening, and this was as simple as it gets. I was afraid that there was going to be a drone while at normal highway and interstate speeds, but there has been neither. With the windows up at 70 miles per hour, it sounds like it did when it came from the factory. I am very pleased with the service and speed of delivery set up by American Muscle and I plan on doing much more in the near future.

    60Pilot

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Alabama

    Helpful (2) (0)

  • 5/5

    So Deep!

    August 17, 2011

    Put these on in place of the flowmaster 60 series axle backs and man what a difference. Louder, deeper, throatier you name it. Have a bassani o/r x with it along with shorty headers and a steeda CAI. Car is a beast and turn heads everywhere i go no matter what gear you are in. True old school muscle car sound. Nothing like flowmaster.

    Antonio

    Year: 2005 Model: GT Driving Style: Daily Driver

    Helpful (2) (0)

  • 4/5

    Louder than stock

    July 30, 2012

    I really ended up liking these, for someone in CA with sound and muffler laws. These are a great upgrade. Now when it comes to install, once the old mufflers are off its a breeze but to take off the stock is a bit of a pain but it can be done. Overall good exhaust not to loud but not quiet.

    Larson

    Year: 2005 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 CA

    Helpful (3) (1)

  • 5/5

    Great Sound!

    September 23, 2011

    I purchased the Flowmaster American Thunder Classic exhaust just 2 days ago and it has already arrived and been installed. I would say that I am pretty mechanically challenged and it took me about 2 hours for the install. After the install, I am very impressed. When I stand behind my car, I can feel the bass of the exhaust rumble in my legs. I have no problem with not being able to hear inside my car or hearing my radio over the exhaust (although I do have the Shaker 1000). I would highly recommend this product to anyone who wants the classic Flowmaster sound with some extra guts to it.

    Featured

    NickS

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Beltsville, MD

    Helpful (3) (1)

  • 5/5

    Wow,... What a difference

    September 01, 2012

    First of all,.... I was amazed at the shipping/delivery. Can't promise this for everyone, but I placed my order with AM early one afternoon, and the FlowMasters were on the front porch the next afternoon! No problems with instalation at all, and that is with being very mechaniclly challenged, and having no lift or ramps. I had have to loosen the H pipe clamps after the mufflers were installed for the proper alignment, then of course tightening everything up again. The "sound clip" video does not do these mufflers justice. I know its hard to capture the sound on camera but thses are so much better in person. Strong, steady, aggessive sound during start-up, take offs, and shifting, but levels off for highway/interstate cruising. I am VERY pleased, with both these mufflers and AM !!

    GrayGT1

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (2) (1)

  • 5/5

    Head Turners!

    June 02, 2012

    I bought these for my wife's 09 GT convertible and i was concerned they might be a little too aggressive. After installing them and having a slight issue with the driver side muffler ( there is a bracket in the way and you cannot get the muffler hanger in without taking it off, i never heard anyone complain about it so it might just be a convertible only bracket) i was stunned about how it sounded at idle and revving it. Awesome sound. However, the 2k rpm drone in 5th gear on the highway is annoying enough to put in down in 4th to gain some sanity back. Again, this might only be a convertible issue seeing how a few reviewers said the 2k drone was no worse than stock. Sound awesome, but i would not consider putting them on a convertible.

    01SnakeSVT

    Year: 2009 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5+ PA

    Helpful (1) (0)

  • 5/5

    sounds great

    September 24, 2011

    Gives it that great rumble and awesome tone. Great price for the product. Will be coming back for more.

    Featured

    ChaseNick

    Year: 2005 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 San Antonio, Tx

    Helpful (1) (0)

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