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Flowmaster Exhaust Systems Flowmaster American Thunder Cat Back Exhaust System - 817664

2,153 Reviews
$1,160.00
List Price
$1,043.95
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Features:
  • Part #: 817664
  • Main piping diameter: 2.5"
  • 40 Series Big Block Muffler
  • Includes dual 3.5" exhaust tips
  • Includes exit pipes for dual rear or dual side exit
  • Flowmaster's American Thunder cat-back exhaust system for the 2009-2018 Toyota Tundra pickup trucks with the 5.7L or 4.6L V8 engines is perfect for the person looking for an aggressive sound level with all of the performance benefits that you would expect from Flowmaster. This DOR/DOS (Dual Out Rear, Dual Out Side) bolt on 409S stainless steel system features dual 2.50 in. tailpipes and 3.50 in. polished stainless steel tips. This system is designed to fit regular cab/long bed, double cab/short bed and CrewMax models. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.
  • American Thunder Cat Back Exhaust System, Dual, Dual Rear Same Side Exit, 2.5 in. Tubing, 40 Series Big Block Mufflers, 3.5 in. Pol. Stainless Steel Tips
  • Mandrel Bent Stainless Steel Tubing, Multiple Exit Styles Provided In Kit, Aggressive Performance Tone, Lifetime Limited Warranty
  • Download installation instructions (PDF)
  • With Dual Exhaust Tips
  • Dual Rear or Side Exit (409 Stainless)
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Product Info
Features:
  • Choose from up to four signature Flowmaster Exhaust series (depending on your vehicle):
  • Outlaw Series: Flowmaster’s most aggressive, race-oriented system perfect for drivers seeking loud sound levels
  • American Thunder: The sound that started it all, with Flowmaster’s original sound levels and performance
  • FlowFX: A moderate tone but without that "chambered" sound, this system still provides all that Flowmaster performance.
  • dBX Flowmaster: Perfect for smaller displacement four- and six-cylinder engines and can be used in both imported and domestic cars and trucks
  • Force II: Features a mild, chambered muffler tone for drivers seeking performance gains with quieter sounds
  • Custom-crafted for your specific year, make and model vehicle
  • Large-diameter mandrel-bent pipes deliver a restriction-free exhaust flow
  • Each kit is powered by Flowmaster's legendary high-performance mufflers
  • Available with single, dual, rear and side exit configurations (depending on your vehicle)
  • You have your choice of aluminized or stainless steel construction (depending on the kit)
  • Includes tubes, mufflers, tips, clamps, hardware & hangers and installation instructions (varies by kit)
  • Stainless steel systems are backed by a limited lifetime warranty
  • Aluminized steel systems are backed by a 3-year warranty
  • Flowmaster Exhaust is proudly made in the USA
Description:

The Flowmaster Exhaust System delivers more than a little sound and power – enjoy impressive horsepower gains, a handy boost in MPG, and the most famous exhaust tone in the automotive world. Not to mention, each Flowmaster Exhaust System is custom-bent from aluminized or stainless steel to fit your specific year, make and model.

Flowmaster has a wide range of different systems for you to choose from. If you want an all-out, loud exhaust system, go with the American Thunder. The Outlaw Series is an aggressive, race-oriented system and almost as loud. The FlowFX series has all that Flowmaster performance with a moderate tone. Sport compacts, imports and Euro machines sound off with the dBX Series, and, for wicked performance with a mild tone, the Flowmaster Force II System is best. Have your pick of single, dual, side and rear exits (depending on the model). Each kit is powered by performance mufflers and comes with all the parts you need for a quick install.

Your Flowmaster Exhaust System is backed by different warranties, depending on the materials used – for aluminized steel, you’re looking at a 3-year warranty, and for stainless steel, there’s a limited lifetime warranty.

Notes:
  • ATTN: State of California Consumers
    warning symbolWARNING: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to www.p65warnings.ca.gov)
Moss Warranty Act Statement

Thanks to the Magnuson Moss Warranty Act: US Code – Title 15, Chapter 50, Sections 2301-2312, your vehicle’s factory warranty is protected by law when you add aftermarket parts.
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Customer Reviews

Average Rating
Appearance
Ease of Installation
Price/Value
Quality
2153 Customer Reviews
5 Star
1505 (70%)
4 Star
517 (24%)
3 Star
83 (4%)
2 Star
30 (1%)
1 Star
18 (1%)

Unleash the beast

Flowmaster exhaust sysrem was easy to install, with all the necessary parts included and easy to follow instructions. Look & sound great. Good upgrade for tuned sound and performance.
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Posted By Ron D (HAPPY CAMP, CA) / November 4, 2018
2016 Toyota Tundra
Yes
No

Flowmaster

Install was simple I am a mechanic sounds great have only drove 20 miles since install would recommend buy
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Posted By Eddy B (BONNER, MT) / February 13, 2018
2014 Toyota Tundra
Yes
No

I would rate 10 stars for the flowmaster

I just love the sound of it i shut my radio so i can enjoying the sound... and the price is unreal compair to the trd exhaust system i love it and thank you flowmaster
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Posted By Chau T (Worcester, MA) / August 21, 2017
2016 Toyota Tundra
Yes
No

Great sound.

Exactly what I wanted, customer service was a great help.
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Posted By Mario R (FEDERAL WAY, WA) / February 21, 2017
2013 Toyota Tundra
Yes
No

Flowmaster American Thunder 2017 Tundra 5.7

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.
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Posted By Adam S (Chesapeake, VA) / February 5, 2017
2017 Toyota Tundra
Yes
No

Typical FlowMaster quality!

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.
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Posted By Andy E (MANDEVILLE, LA) / January 3, 2017
2015 Toyota Tundra
Yes
No

Awesome system

Sounds great, at a fair price compared to a standard system.
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Posted By Scott A (Slinger, WI) / December 21, 2016
2017 Toyota Tundra
Yes
No

For a 2014 Tundara Crewmax

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!
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Posted By Brett H (Granbury, TX) / July 8, 2016
2014 Toyota Tundra
Yes
No

Super 40 Drone @60 mph (Tundra 5.7)

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.
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Posted By Roland G (Baton Rouge, LA) / March 17, 2016
2014 Toyota Tundra
Yes
No

Installed on a 2014 Toyota Tundra 4.6

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!
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Posted By Edward F (Seguin, TX) / February 23, 2016
Yes
No

Best Exhaust

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.
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Posted By Michael M (POTTSVILLE, PA) / January 29, 2016
2015 Toyota Tundra
Yes
No

Flowmaster american thunder for 2015 Tundra

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.
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Posted By Daniel P (BEL AIR, MD) / December 27, 2015
2015 Toyota Tundra
Yes
No

Ok, not great

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.
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Posted By Terrence M (Roswell , GA ) / November 9, 2015
2015 Toyota Tundra
Yes
No

Flowmaster Quality

Flowmaster has been an exhaust and performance mainstay for years. My most recent purchase was disappointing. The pipe bends are not as smooth and fluid as other Flowmaster system I bought and the system came with the wrong size clamps in the box, so installation was delayed two weeks. I hope Flowmaster is not becoming complacent and allowing quality to slip.
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Posted By Kimothy C (Linden , VA ) / September 30, 2015
2012 Toyota Tundra
Yes
No

American Thunder exhaust on my 2012 ToyotaTundra

Sounds great, looks great! I installed it in my garage without a lift, took about 1.5 hours. The extra hanger by the spare tire took a little longer to figure out, but the directions were pretty straight forward. I would definitely recommend to my friends. Auto Anything offers great deals. Very happy with my purchase.
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Posted By Kelly S (BISMARCK, ND) / July 29, 2015
2012 Toyota Tundra
Yes
No

FLOWMASTER AMERICAN THUNDER

This exhaust system is awesome. It was installed by a professional who found all parts to fit as they should and easy to install. The sound is terrific. I highly recommend this system.
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Posted By JOHN R (LAWRENCEVILLE, VA) / July 21, 2015
2012 Toyota Tundra
Yes
No

Awesome

sounds great
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Posted By Tayson W (Idaho Falls, ID) / March 4, 2015
2015 Toyota Tundra
Yes
No

Sounds Tough !!!!

Not too loud, just right! I get a lot of compliments on the sound. Everybody wants to know where I got it and I tell them AutoAnything!
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Posted By Richard B (Nome, TX) / January 11, 2015
2014 Toyota Tundra
Yes
No

Great Exhaust System, Flowmaster American Thunder Stainless

I wanted a nice moderate great sounding exhaust system and that's excatly what I got. Auto anything had the best price on the American Thunder system and Flowmaster had a $75 manufacturer rebate as well. The system sounds moderate when at low idle, but when you step on the gas you get a good aggressive rumble and powerful sound. I didn't hear a drone as some reported on the highway at 65-80 MPH. The system took about an hour to install and the stainless tips really stand out!
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Posted By Juan B (VIRGINIA BEACH, VA) / January 10, 2015
2013 Toyota Tundra
Yes
No

American Thunder Toyota Tundra

Installation was easy and to the point. I recommend using lift or jack stands, and not be impatient like me and roll all over the ground trying to install it. The stainless tips look awesome, it sounds like a real truck now. Got an Afe CAI closed box with throttle body spacer. All of the components together WOW. Only down is drone noise between 58-65 mph. Auto anything was awesome as always, with service and price, cant beat it.
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Posted By Brian J (Fort Knox, KY) / November 24, 2014
2014 Toyota Tundra
Yes
No

super easy installation

Very easy install...thought this system would be to loud but sounds great...has that distinctive flowmaster growl.had system installed in an hour using jack stands.
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Posted By Mark P (PUNXSUTAWNEY, PA) / November 8, 2014
2018 Dodge Durango
Yes
No

Flow master exhaust

i love it's awesome! Installation was easy took about 45 mins start to finish. I love the sound too!
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Posted By Sean S (OAK HARBOR, WA) / October 10, 2014
2014 Toyota Tundra
Yes
No

Awesome sound, awesome power!!!!

Installation was quick and easy. Instructions were easy to follow. Sound is unbelievable. Yes, i would get better MPG but I can't seem to keep the pedal off the metal. Punch it and listen to it roar.
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Posted By Abraham C (AURORA, CO) / September 10, 2014
2013 Toyota Tundra
Yes
No

Sounds like ass

Can't even hear it , no point in doing this set up from stock its a waste of money . I'd go another brand if I did it again
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Posted By A&L H (Glenolden, PA) / July 21, 2014
2010 Toyota Tundra
Yes
No

2014 tundra

Installation was a breeze. Tone is great and keeps getting better as it breaks in
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Posted By jonathan w (Norridgewock, ME) / June 20, 2014
Yes
No
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