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Flowmaster Exhaust Systems Part #817664 Customer Reviews

Average Rating

25 Customer Reviews

Flowmaster American Thunder 2017 Tundra 5.7

Reviewed by Adam S (Chesapeake, VA) Reviewed for a 2017 Toyota Tundra — Feb 05, 2017 2:34 PM

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I bought the American Thunder system it sounded great outside but the drone at 1600-1700 rpm in the cab was to bad for me,I swapped out the original 40 series muffler that came with the kit with a super 40 delta flow series and it sounds 100 times better just as loud outside the cab with a much deeper tone and no interior drone what so ever, I got such a good deal on the kit I didn't mind buying the super 40. Would buy again.

Typical FlowMaster quality!

Reviewed by Andy E (MANDEVILLE, LA) Reviewed for a 2015 Toyota Tundra — Jan 03, 2017 9:51 AM

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I received this as a Christmas gift and was thrilled. The packaging was a big box and was flawless. Even the fasteners came in individual heavy ziploc bags. Installation was a breeze. (I have a 6" lift and did it in my driveway.) Everything fit and lined up perfectly - with just a few minor adjustments before tightening everything in place. Sounds and looks great.

Awesome system

Reviewed by Scott A (Slinger, WI) Reviewed for a 2017 Toyota Tundra — Dec 21, 2016 2:47 PM

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Sounds great, at a fair price compared to a standard system.

For a 2014 Tundara Crewmax

Reviewed by Brett H (Granbury, TX) Reviewed for a 2014 Toyota Tundra — Jul 08, 2016 8:53 PM

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It's OK but not as Racy as I wished. Should have gone with the Outlaw system with the black tips. I was worried trepid about committing to the loudness of the Outlaw, but after getting the American Thunder system , and watching YouTube videos with my truck having the Outlaw I wished U had chosen otherwise. Having said that, I would rate the quality of service from Auto Anthingvthrough the roof. In most cases my orders come the very next day having been shipped from San Diego. With free shipping!

Super 40 Drone @60 mph (Tundra 5.7)

Reviewed by Roland G (Baton Rouge, LA) Reviewed for a 2014 Toyota Tundra — Mar 17, 2016 1:55 AM

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Great exhaust. Sounds AWESOME. Pros: Growls when started, Quiet at idle, rumbles when you get on it. Cons: low tone DRONE at 1800 rpm which puts mph at 60mph. cruising speed.


Reviewed by John K (KISSIMMEE, FL) Reviewed for a 2014 Toyota Tundra — Mar 05, 2016 10:48 AM

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I have had flowmaster for years on all my sports car and now my truck. The American Thunder series is awesome. Just the right amount of rumble and a few extra horse power. And it's not to loud in the cab which I was worried about in the beginning but it's perfect. If your just cruising you hear just a small amount of the nice rumble but when you get on it it's fantastic the deep and aggressive rumble you hear coming out of the truck. Now my truck sounds like a truck should. Recommended it !!!

Installed on a 2014 Toyota Tundra 4.6

Reviewed by Edward F (Seguin, TX) — Feb 23, 2016 4:24 PM

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This exhaust souns and looks great. My one issue is the nuts and bolts to hold the chrome tips on were way to small. I hope this was a slip up in packing the parts. I installed this in about an hour in the parking lot were my Wife works. It was her 60th birthday gift. She came home from work smiling from ear to ear. Great system, I highly recommend it!

Best Exhaust

Reviewed by Michael M (POTTSVILLE, PA) Reviewed for a 2015 Toyota Tundra — Jan 29, 2016 6:19 AM

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Overall the quality, price, and easy of installation is far superior then any other exhaust system. Highly recommended over any other system esp when you can get them on sale.

Flowmaster american thunder for 2015 Tundra

Reviewed by Daniel P (BEL AIR, MD) Reviewed for a 2015 Toyota Tundra — Dec 27, 2015 2:59 PM

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I'm happy with my purchase especially at the sales price and with the rebate offer. The exhaust sounds nice at idle and when you hit the accelerator - a nice deep agressive sound. Only complaint is at 1400-1600 rpm there is what I described as droning or a deep rumbling sound. Overall, not too bad, but a sound that is noticable in the cab at those rpms. I thought the install was straight forward and parts well labeled; took a little over an hour to install. Tack welded joints for sturdiness.

Ok, not great

Reviewed by Terrence M (Roswell, GA) Reviewed for a 2015 Toyota Tundra — Nov 09, 2015 10:01 PM

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The kit I ordered came with seven 3inch clamps when even the directions listed the system was 2.5inch. So I had to run and buy the right ones at a local auto store. The hanger for the additional rear tail pipe was too small as well. I like the sound and overall look, but I was pissed about the carelessness of part packing quality control.

Flowmaster Exhaust Systems - 817664

Cat Back Exhaust - American Thunder Series
  • $255.97 - $1,557.97
  • Free Shipping
  • Ships By 2/23
  • What Do You Drive?


  • Style:
    Dual rear/dual side exit (409 Stainless)
  • Part #:
  • 2.5 in. Tubing
  • Includes 3.5 in. Stainless tips
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