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Flowmaster American Thunder Cat-Back Exhaust - Dual Side/Rear Exit (15-17 5.0L)

Market Price $850.99 You Save 13% ($111.02)
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  • Item T527020D
  • MPN# 817725

Will this fit your F-150?

Features, Video & Details

  • Aggressive Flowmaster 40-Series Delta Flow Sound
  • Durable 409 Stainless Steel Construction
  • 3 in. Inlet, Dual 2.5 in. Outlet Mandrel-Bent Tubing
  • 3.5 in. Polished Stainless Steel Tips
  • Simple Bolt-On Installation
  • Choice of Side or Rear Exit
  • Made in the USA
  • Fits 2015-2017 5.0L F-150s, Except for Regular Cabs with a 6.5 ft. Bed

Review & Installation Video

Review & Install Video

What's up everybody? Justin with and this is my review of the Flowmaster American Thunder dual exit catback exhaust system available for five liter Ford F-150s. All right guys, let's get right into things. Now Flowmaster obviously needs no introduction, right? They're one of the largest manufacturers of aftermarket exhaust systems, been around for 50-plus years and they're made right here in the US of A. Now, the American Thunder catback is just one a few different offerings for your new F-150, and it's built around the iconic super 40 series muffler. Now this muffler is the muffler that defined that Flowmaster sound. It's the one they've been using ever since the start, and as you guys just heard, it's gonna give your rig that nice aggressive tone. Now, with that being said, it isn't the most aggressive system they offer. That title goes to the Flowmaster Outlaw series. Still, this is a solid four out of five on my one-to-five or one-to-wake-the-neighbors scale. It is aggressive. It is gonna wake the neighbors a little bit, but they're not going to call the police on you. Now one thing I really do like about this system from Flowmaster is they give you the option of either going with a side rear exit using this pipe or just straight out the back using this pipe, and that's something that a lot of other systems don't really give you the option of, and they do include both pipes here with their kit. One thing that is worth pointing out, though, with the Flowmaster American Thunder catback - this thing has been known to drone a little bit while cruising on the highway. I personally don't think it's that big of a deal. It's almost expected when you're working with that much tone, but it is worth pointing out. Here's my overview - I dunno, maybe turn up the radio a little bit. Price is going to be pretty competitive with some of the other aftermarket catbacks I've seen for the new F-150s. Not going to be the cheapest but it's certainly not gonna be the most expensive either. Therefore, it's gonna land you somewhere in the middle road in regards to overall impact to your wallet. Material-wise, here's what you're looking at guys: full 409-grade stainless steel throughout, 3 inch primary tubing coming off the cat, in to the super 40 series muffler where it kicks down to two-and-a-half inch tubing and then exits out the three-and-a-half inch brightly polished tips featuring that Flowmaster logo. Install, guys, really not that bad. A solid one out of three wrenches on our overall scale of difficulty. Now depending on your bed size or your cab size you might have to cut this system. Flowmaster does include an expansion pipe, but just to give you a for-instance here, we have a supercrew 5-and-a-half foot bed F-150, we did not have to use the expansion pipe and didn't have to cut whatsoever. Either way, really not all that bad. An extra set of hands wouldn't be a bad idea but figure about an hour or two from start to finish getting this thing bolted up. In my opinion, the Flowmaster American Thunder catback would be an awesome choice and here's why. If you can put up with a little occasional drone from time to time, you're going to have a tough sounding system made with full stainless steel and gives you the flexibility of going with a side or rear mounted tip. Be sure to check out American Thunder from Flowmaster for your ride, right here at

Signature Flowmaster Sound. Give your Coyote powered F-150 that unmistakable Flowmaster sound with the American Thunder Cat-Back Exhaust System from AmericanMuscle. The Flowmaster American Thunder Cat-Back Exhaust with its mandrel bent tubing will greatly improve your 5.0L F-150's exhaust flow for an increase in power. The included Super 40 Series Delta Flow Muffler will improve your exhaust's sound for a deep aggressive exhaust note.

Quality Construction. Proudly Made in the USA, this Flowmaster American Thunder Cat-Back Exhaust is constructed from durable 3.0 in. inlet and dual 2.5 in. outlet 16 gauge 409 stainless steel tubing for it's strength and corrosion resistant properties. This Cat-Back Exhaust features a Super 40 Series Delta Flow American Thunder muffler, that connects to a pair of 3.5 in. diameter polished stainless steel tips for great looks and sound. As an added bonus, the tips are embossed with the "Flowmaster" logo for true custom styling.

Bolt-On Installation. Flowmaster engineered this kit to be a direct upgrade replacement for your F-150 stock exhaust. All of the necessary hardware is included and installs easily with basic hand tools, with no extra modifications to your F-150. Depending on your cab and bed size, some minor cutting to the piping may be required.

Lifetime Warranty. Flowmaster is confident in the quality of their exhaust system by backing it with a Lifetime Limited Warranty. Some exclusions do apply, please see manufacturer's warranty for full details.

Application. This Flowmaster American Thunder Cat-Back Exhaust System is designed to fit the 2015 to 2017 5.0L F-150s with the following Cab and Bed sizes.
  • Regular Cab with a 8 ft. Bed
  • SuperCab with a 6.5 ft. Bed
  • SuperCab with a 8 ft. Bed
  • SuperCrew with a 5.5 ft. Bed
  • SuperCrew with a 6.5 ft. Bed

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) Inlet Pipe
  • (1) Adapter/Extension Pipe
  • (1) Muffler
  • (1) Right Tailpipe
  • (1) Left Tailpipe - Front
  • (1) Left Tailpipe - Rear
  • (2) Side Exit Pipes
  • (2) Rear Exit Pipes
  • (2) Stainless Tip
  • Hardware Kit
Installation Info
Will it fit my F-150?

Most Helpful Reviews

Just what the driver ordered!

Added so much life to my 5.0! Ford should offer this exhaust at the dealerships.

Helpful (1)


The flowmaster exhaust system was easy to install. Even better with a lift to get under the truck. The sound is amazing. I feel sorry for my neighbors starting in the morning for work

Helpful (1)

Overall Rating 4 out of 5 stars
Read All 6 Reviews

Customer Photos (1) Submit Your Photo

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3 Questions / 2 Answers

Ask a Question

I'm looking for a cat-back duel tail pipe system (this system) with a Flowmaster 50 series Delta flow muffler. I feel like I have searched everywhere but I can't seem to find what I'm looking for, or it may not be available for my truck, I'm not sure which. I was wondering if you could point me in the right direction. The 40 series is just a little too aggressive for what I wanted, but if the 50 series is not available for this set up I might have to go with the 40. any help would be greatly appreciated. Thank you


  • Unfortunately, we do not carry a Flowmaster catback exhaust that uses the Flowmaster 50 Series muffler. Your best bet would be to contact Flowmaster, or replace the mufflers in a Dual Tail Pipe System with the Flowmaster 50 Series muffler.


Helpful (0)

Those pipes bounce around quite a bit in the video and makes the workmanship look a bit shoddy (not yours, Flowmaster's). Other manufactures seem to secure the pipes to the frame right before the rear bumper and do not bounce around. Do you know if there are hangers or something from Flowmaster that would mitigate that?


This may be a side note but what lift is on the maroon truck. I ordered this muffler and would like my truck to look like this.


  • Hi, The lift kit on our maroon F-150 is a Rough Country 6 in. Suspension Lift Kit Item# T527476. Here is the link

    Chris J

Helpful (0)

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Customer Reviews (6) Write a Review

Overall Rating 4.0

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 4.8 4.8
  • Exhaust Note 5 5
  • Fit & Finish 3.2 3.2
  • Bang For Your Buck 3.8 3.8

  • 3/5

    Installation Time: Afternoon

    April 30, 2017

    Not what I thought it was going to be :/

    Install wasn't bad except for the horrible clamps. I don't have an impact wrench so I couldn't get them 100 tight so I ended up going to a exhaust shop and having them hit all the clamps with an impact wrench. I've had the exhaust on for 6 months now and sadly it has started to rust (see pics). For close to $800 I would have expected better quality tubing. I shouldn't have to paint it, but I will. I love the sound, but nothing much else about the whole experience.


    Year: 2016 Submodel: 5.0L V8 XLT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    October 31, 2016

    Just what the driver ordered!

    Added so much life to my 5.0! Ford should offer this exhaust at the dealerships.


    Year: 2015 Submodel: 5.0L V8 XL

    Helpful (1)

  • 5/5

    August 02, 2016


    The flowmaster exhaust system was easy to install. Even better with a lift to get under the truck. The sound is amazing. I feel sorry for my neighbors starting in the morning for work


    Year: 2016 Submodel: 5.0L V8 FX4

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    October 16, 2015

    The 5.0 is alive in the F-150

    The kit: The kit was package well and all the parts were labeled for easy identification. The only negative would be the lack of instructions. (Missing) This was easy to correct on Flowmaster site. The instruction could be downloaded. They also have video to watch if you want to view Install: The removal and install is relatively simple. I completed the project on my garage floor with a jack and stands. The only difficulty that I had was lifting the truck at a comfortable/safe work height to remove the factory exhaust. The instruction suggests “cutting” the factory mufflers off which would be easier but also ruins the factory exhaust. It takes some muscle and patients but I did remove it with out cutting it. The installation went smooth. Number 1 Trick/tip. Just “snug each bolt as you install each part of the kit and use a couple bungee cords to help support the kit in place as you install each section. Once you have everything “snugged” in place check to make sure the muffler is level. Once the muffler is level tighten all the bolts starting from the front and working towards the back of the kit. The tips will require some measurements and several adjustments to get each side exactly the same. Performance/sound: The best part! Nothing beats the rumble of the 5.0. The exhaust has a sweet rumble at idle and really becomes powerful when you floor it. The exhaust is not too loud. At highway cruising speed it has a nice tone that does not overpower the cabin. I did not notice an increase in mile per gallon or that dramatic gain in HP.(feels a little quicker in response but I don’t drive my truck that aggressively) My truck sounds great and the dual exhaust out the side looks great. Highly recommend this kit!


    Year: 2015 Submodel: Lariat Lincoln University, PA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    July 19, 2017


    Couldn't be more happy with this kit. Sounds great, turns heads, easy install, great value.


    Year: 2015

    Helpful (0)

  • 1/5

    Installation Time: Afternoon

    November 05, 2016

    Worst clamps I've ever come across!!!!

    Sounds great lots of drone but that's the way it goes! But every clamp does not hold like it should!!! I used a impact gun and they are all all coming lose! I'm going to weld it solid! This has zero to do with A/M everyone at American muscle is great!!! I have zero complaints with them! But Flowmaster dropped the ball with the fit and finish!


    Year: 2016 Submodel: 5.0L V8 XLT

    Helpful (0)

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