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Flowmaster

Flowmaster 817460 American Thunder Axle-Back Exhaust Kit 2.5 Inch 409 Stainless Steel 4 Inch Stainless Tips Compatible with 2005-2010 Ford Mustang GT, GT500, California Special 4.6L 5.4L

Based on 17 reviews
Condition: New
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$649.95

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Availability: 11 left in stock
Fulfilled by Holley Performance Product
Arrives Wednesday, Nov 11
Order within 10 hours and 52 minutes

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At a glance

Condition
New
Dimensions
35.4 x 17.1 x 16.8 in
Weight
30 lb
Material
Plastic
Vehicle Service Type
Car
Inlet Connection Size
2.5 in
Automotive Fit Type
Vehicle Specific Fit
In the box
Flowmaster 817460 Axle-back System 409S - Dual Rear Exit - American Thunder - Aggressive

Features 8

  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Moderately Aggressive Exterior Exhaust Tone
  • Large 4.00-inch Polished Stainless Steel Tips

Specs 21

Brand Flowmaster
Material Plastic
Item dimensions L x W x H 35.4 x 17.1 x 16.8 inches
Vehicle Service Type Car
Item Weight 30 pounds
Brand Name Flowmaster
Manufacturer Part Number 817460
UPC 700042022199

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Nov 11

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

Excellent sound and easy installation
Style: Base Product
Bought these for my 2007 mustang. Installation was easy (two bolts per hangar, two hangars per side) and painless (except that two bolts easily snapped when taking off my stock mufflers, but that's another story). The beauty of these is that they are not as wide as the stock mufflers, so it is easier to install them since you have direct access to all of the hangar bolts. The stock mufflers make it harder to get to some of the bolts, so be prepared to need to use a smaller ratchet set or a wrench to get to some of them. As far as the mufflers go, these are the most aggressive Flowmasters. They have an excellent sound from outside of the car and to the rear. I was immediately surprised by how much more noticeable it was inside the cabin of the car. After driving it for a bit, the harmonics from the driver's seat made it such that my head and inner ear hurt. :-( In the back seat, it sounded perfect. Driver's side and passenger, great sound, but it did slowly hurt. After being teased about it, I got those same people to confirm the front seat harmonics on my 2007 mustang, with one of them saying afterwards "How come I feel like I just came away from a rock concert? My head feels like it is full of cotton." In the end, I sold these to a friend of mine within a few days, and I installed them on his 2010 Mustang. Installation again was a snap, done in 1 hour (the 2010 has one extra bolt on the driver's side rear hangar). Sounded awesome, and the sound inside the cabin was no issue at all -- must be a difference in the model year Mustang or something. He drove away with the intense low growl that these mufflers provide. Definitely worth purchasing these to introduce some attitude to the sound of your car. Very happy with the product and the packaging! ... show more
Reviewed in the United States on June 23, 2012 by Rich W
Screamin Pony!
Style: Base Product
I installed these in about 2 hours because I have big hands and the bolts were hard to get to. Man, these things made my stock mufflers sound like a little baby exhaust on a Prius. It took about a week for me to adjust to cabin noise because of the drastic difference in sound levels. But I constantly get stares from everyone while cruising or sitting at a light. WORTH. EVERY. PENNY. I have taken my car into a couple shops for nick knack stuff here and there, and nearly every time, the mechanics pull me aside and say that it's one of the best exhaust notes they've ever heard. One of which saying that while pointing at a turbo'd Z06 on a lift. Did I say worth every penny yet? Well, WORTH. EVERY. FLIPPIN. PENNY. ... show more
Reviewed in the United States on January 22, 2014 by Blake Gorham
Nice product and installs easy
Style: Base Product
Listened to a recording before buying. Loved how it sounded. Now that they are in the car I still love how they sound outside the car. But there is a good bit of drone between about 1600 and 2000 rpm under light load. My wife does not like it at all. I tolerate it knowing how great they sound outside. ... show more
Reviewed in the United States on October 18, 2014 by Rick
Aggressive! responsive!
Style: Base Product
For some reason, im not really sure what happened but it was only $ + 300.00 here in Amazon wherein everywhere else sells this for $ 500.00. I pulled the trigger of course and i cant never be happy. Honestly i experience the " drone" effect whenever i hit 3500K-4000K RPM on the freeway on 4th gear. I just go aliitle bit over that and shift to fifth no hassle. I'd like the noise (Music) thou so sometime i just keep it like that for a little while. Do not hesitate to buy this product. big response even when idled. ... show more
Reviewed in the United States on January 3, 2013 by mdavid_photography
Great sound, but...
Style: Base Product
These mufflers are quality-designed and built. The fitment is near perfect and they sound amazing at idle and on acceleration. However, the "drone" at cruising speeds is ridiculous. With my music cranked, windows up, it will still cause driver and passenger to have headaches. If your Mustang is a daily-driver, beware. If you only take it out on nice days and/or to the track, these mufflers may be for you. ... show more
Reviewed in the United States on December 24, 2012 by Ford Guy
Definitely worth the price
Style: Base Product
I got this back in Dec and after a 2 hour install myself I was amazed at how much beefier the exhaust sounded compared to stock. A ton of fun for around $300. These 40 series though can get a little loud at certain rpm but that's what I wanted. If stock is loud enough for you then I won't bother with these. But if you like that muscle car sound, then this is the ticket! ... show more
Reviewed in the United States on June 22, 2012 by Dominic37
Awsome!
Style: Base Product
This exhaust hits an awesome note. I put it on myself in an hour and found it cheapest here on amazon. I have buddies that spent 6 and 7 hundred dollars for their exhaust and mine sounds better. Do not be afriad of this exhaust being too loud or having a drone. It is perfect if you want to hear your cars exhaust. ... show more
Reviewed in the United States on June 8, 2011 by Chad J
Rattle
Style: Base Product
Nice addition to my Mustang but with the rolled ends on the tips they rattle and I have to put different tips on.
Reviewed in the United States on February 9, 2016 by Don
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