15-20 F150 Flowmaster American Thunder Cat-Back 817725

Highlights:

Aggressive Muffler and Resonator Delete
Loud, Aggressive Roar
Dual 2.5" Diameter Pipes
409 Stainless Steel
Your Choice of Tip Exit

Awesome, Deep Exhaust Note

The stock exhaust note of the 2.7L and 3.5L EcoBoost V6 F150s isn't much to write home about, and the 5.0L V8's exhaust tone is outright disappointing. The good news is that our friends over at Flowmaster Exhaust are to help with their American Thunder Cat-Back Exhaust Kit for the 2015-2019 EcoBoost, 3.5L V6, and 5.0L V8 F150s. This kit has larger exhaust tubing than stock, an aggressive muffler design, and resonator delete that all work together to generate an absolutely ferocious and deep tone for your custom F150 build. The Flowmaster Cat-Back System even changes your 2015-2017 F150's exit configuration into your choice of dual straight out the rear exit or out the side exit with its two sets of exhaust tubing leading to the system's oversized tips. The kit is an excellent way to get just the sound, performance, and look you want out of your wicked 2015-2020 F150 build, all in a high-quality package that won't let you or your 2015-2020 F150 down in just about any application you have in mind.

409 Stainless Steel Exhaust Kit with your Choice of Tip Exit

The Flowmaster American Thunder Cat-Back Exhaust Kit offers up near-perfect fitment for almost all of the 2015-2017 F150 wheelbase sizes, and was designed from the ground up to give your truck an impressive, new sound. Flowmaster builds each of their American Thunder Kits around one of their Super 40 Series performance mufflers that utilize Flowmaster's unique Delta-Flow chambered internal design that gives your truck a deep rumble and aggressive new levels of sound volume while cancelling out a lot of the annoying high-pitched frequencies that cause rasp and drone. The muffler has a single 3" inlet that then splits into dual 2.5" outlet tubes. The outlet tubes are each mandrel-bent to ensure smooth exhaust outflow with minimal restrictions and come with modular tubing that lets you choose between a straight out the rear exit or dual rear side exit tip configuration to meet your styling needs or application. The kit is rounded out by a pair of aggressive 3" polished 304 stainless steel exhaust tips embossed with the Flowmaster logo. The rest of the kit is made out of 409 stainless steel and comes with installation hardware and instructions. Flowmaster backs each of their 409 stainless steel systems with a Limited Lifetime Warranty.

Wheelbase Fitment: This kit will fit all 2015-2020 F150 EcoBoost wheelbase options except for Standard Cab/Short Bed F150s with a 122" wheelbase.

2019-2020 Limited Fitment: this cat-back kit will not fit 2020 F150 Limited models due to their different exhaust configuration. 2019, 2020 Limiteds with require a 2017, 2018, 2019, 2020 Raptor cat-back system.

Write a Review

2015 FORD F150 XLT 5.0

I installed it myself, 4 hours, a lot longer than it really needed to take including setup. The clamps that come with the exhaust is 100% crap, I do not trust any of them so I went to AutoZone mid install and got clamps from there, $8.99 each stainless steal, they worked great. So get new clamps before even installing. I took out the old exhaust and installed this myself with no cutting. Sound to me is not as extreme as I have thought by other reviews, then again I own a Mustang with SLP Loudmouth Pipes. I feel like i can driftish out the neighborhood and not wake a soul. I love the sound and I don't feel a drone problem, maybe KNN 776 CAI and SCT X4 has changed that for me. You hear it and say Ford V8.

Did you find this helpful? 9 of 14 Found Helpful

Reviewed by: Michael from Parkville on 2/20/2016

2015 F150 5.0

Install was easy and under an hour. Nice system only issue was that I was missing one clamp. This is a loud system so if that is what you are looking for this is definitely it. Love it and get lots of compliments..

Did you find this helpful? 3 of 4 Found Helpful

Reviewed by: Joseph Becker from Brick NJ on 3/31/2017

2018 F150

This thing is loud. There’s nothing modern about it in my opinion. It’s 100% aggressive. My buddies 7 year walked by my truck with a paper cup of water, I floored it and he jumped so high his water spilled all over his face, At 5am it rumbles through the house, I idle through my neighborhood, when there’s a lag on the 5.0, the drones pretty loud (I notice it at 45, 65, 70), and the passenger side exit rear piece has a downward bend instead of straight out like drivers side. I got used to it, no long road trips, but a lot of in town driving. I thought about changing out the muffler section, but the overall result I got used to quick.

2015-2020 F150 FLOWMASTER American Thunder 304 Stainless Steel Dual Rear Cat-Back Exhaust System Review Image!

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: James from Carefree on 5/14/2019

2016 f150 5.0L

Installing this system was a breeze. As far as sound goes, it's gnarly! Drone in the cab at 60mph is there. When there is a slight load it hums pretty good. Other than that it's definitely American thunder!

Did you find this helpful? 2 of 3 Found Helpful

Reviewed by: Chayce Walker from WI on 1/25/2017

Is it possible to have the polished tips swapped with black tips?

Asked by: Michael Bungori - 5/20/2019

Unfortunately, this kit only comes with polished tips as standard. Black tips would need to be purchased separately.

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Answer provided by: Jason@Stage3 (5/21/2019)

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Will this work with the larger 36 gallon gas tanks, and can you keep the spare?

Asked by: Mike - 4/19/2017

This kit will work just fine with 36-gallon fuel tanks, and you can keep your spare tire as long as it's the factory spare and not an oversized spare.

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Answer provided by: Jason@Stage3 (4/20/2017)

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I have the F150 lariat FX4. Will this exhaust fir my truck?? I'm only asking because it says that it doesn't fit the naturally placed F150?? What is the naturally placed F150??

Asked by: Robert - 1/3/2016

According to Flowmaster, this kit actually will fit the naturally-aspirated 3.5L V6. The issue with the 2015 and 2016 F150s is that there is a 3.5L EcoBoost V6 (turbocharged and direct-injected) and a naturally-aspirated 3.5L V6 (no turbochargers with standard rail injection), and not all parts and exhaust systems are cross-compatible.

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Answer provided by: Jason@Stage3 (1/4/2016)

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Hey do yall have a video of this installed on an Ecoboost yet? Before dropping this kind of money I wanted to hear how it sounded if possible.

Asked by: Derek - 10/30/2015

We haven't started our exhaust testing as of yet, though it will probably be happening here in the near future.

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Answer provided by: Jason@Stage3 (10/30/2015)

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When do you expect this system be released?

Asked by: DR - 2/19/2015

Last I personally heard was early March, though availability is also going to depend on pre-order volume.

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Answer provided by: Jason@Stage3 (2/23/2015)

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Have Questions?

WARNING: Cancer and Reproductive Harm

This product can expose you to chemicals including those known to the State of California to cause cancer and birth defects or other reproductive harm.

For more information, visit www.p65warnings.ca.gov.

2015-2020 Ford F150 Flowmaster American Thunder Cat-Back Exhaust Kit | 817725

817725

Awesome, Deep Exhaust Note

409 Stainless Steel Exhaust Kit with your Choice of Tip Exit

Is it possible to have the polished tips swapped with black tips?

Will this work with the larger 36 gallon gas tanks, and can you keep the spare?

I have the F150 lariat FX4. Will this exhaust fir my truck?? I'm only asking because it says that it doesn't fit the naturally placed F150?? What is the naturally placed F150??

Hey do yall have a video of this installed on an Ecoboost yet? Before dropping this kind of money I wanted to hear how it sounded if possible.

When do you expect this system be released?

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