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Flowmaster Exhaust Systems Part #817680 Customer Reviews

Average Rating

9 Customer Reviews


Reviewed by brian m (WAKARUSA, IN) Reviewed for a 2013 Chevy Silverado — Jun 26, 2016 4:33 AM

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went together good had no problems with installations

My exhaust

Reviewed by Evan T (EATON, OH) Reviewed for a 2010 Chevy Silverado — May 13, 2016 8:39 PM

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Looks great puts out a deep sound but I expected it to be louder! Clamp screws for the exhaust tips are too small.. And the 45s to angle your tips are more like 90 degree instead of 45 degree! Wishing I would have purchased the louder muffler now that I have heard this one! But it looks great overall!

Flowmaster echaust

Reviewed by phillip R (LITCHFIELD, MI) Reviewed for a 2011 GMC Sierra — Dec 21, 2015 4:04 PM

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Love the sound and ease of installation

2007 GMC Sierra Crew Cab 5.3

Reviewed by Randy L (EVANSVILLE, WI) Reviewed for a 2007 GMC Sierra — Sep 22, 2015 5:45 AM

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I like Flowmaster exhaust so I bought the American Thunder Series and installed it, I like the idea that you have the option of running it straight out by the bumper or 45 degree angle like stock. It has a real nice deap muscle car tone to it which I really like along with the chrome tips that really look nice that set it off.

great addition

Reviewed by Brandon B (NEWVILLE, PA) Reviewed for a 2007 GMC Sierra — May 03, 2015 6:57 AM

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Easy to install and sounds great. Can't complain about the fit for a system that fits multiple vehicles.just need to cut off one of the hangers that isn't used on my truck. A little expensive but it will be the last exhaust I will ever have to buy.


Reviewed by Kyle S (EAGLE, WI) Reviewed for a 2011 Chevy Silverado — Jan 30, 2015 8:10 PM

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1 of 2 people found the following review helpful.

Sounds great

Sounds great!

Reviewed by Kevin B (MACOMB, MI) Reviewed for a 2011 Chevy Silverado — Nov 06, 2014 9:55 PM

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3 of 3 people found the following review helpful.

I bought this to improve the sound of my truck. I ended up getting the American Thunder series. The install was not bad at all took a little over an hour. It is not too loud has a deep rumble and there is almost no drone when driving on the highway. I highly recommend this to anyone looking to upgrade their exhaust

American Thunder series

Reviewed by Richard M (Taylorsville, KY) Reviewed for a 2011 Chevy Silverado — Nov 04, 2014 5:30 AM

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2 of 2 people found the following review helpful.

Very nice sound, deep tone, exactly what I was looking to get from my truck. Acceleration was made smoother with more power. MPG gains I haven't found yet but I feel it will happen. There is some drone more so when AFM kicks but it's not something that will drive you crazy. Quality and build of the piping is great and the fit is pretty good, some minor adjustments where needed. I had access to a lift which helped so that made installation much easier and took about 40 mins. Hope this helps.

American Thunder

Reviewed by Thomas P (Heuvelton, NY) Reviewed for a 2012 Chevy Silverado — Aug 01, 2014 12:31 AM

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2 of 3 people found the following review helpful.

Nice system but too loud for what I wanted. Wish I had gotten the Force II.

Flowmaster Exhaust Systems - 817680

Cat Back Exhaust - American Thunder Series
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  • Style:
    Dual rear/dual side exit (409 Stainless)
  • Part #:
  • 2.5" Pipe
  • Includes extension pipes for dual side or dual rear exit configurations
  • Super 40 Series Muffler
  • 3.5" Polished Stainless Tips
  • Lifetime Limited Warranty
  • Click for sound clip (mp3)
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