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Flowmaster American Thunder Dual Exhaust System - Side/Rear Exit (15-18 5.0L F-150)

Market Price $850.99 You Save 10% ($88.31)
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  • Item T527020D
  • MPN# 817725

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    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 2015-2018 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

    Power Packed Performance. AmericanMuscle’s Flowmaster American Thunder Cat-Back Exhaust delivers a sound like no other. It’s a signature roar as complex and power-driven as its architecture. To achieve it is to hear it: a mandrel bent tubing to make better use of your 5.0L F-150's exhaust system, bringing even more unsurpassed on-board control unmistakable in your Coyote-powered F-150’s amplified boom.

    Distinctively American-Made. the American Thunder Cat-Back Exhaust is a masterpiece in innovative ingenuity and painstaking engineering. It is focused on delivering peak performance its Flowmaster pedigree expects. The unparalleled Flowmaster 40-Series Delta Flow Sound is more than just upgrade, it’s an entirely new level of power.

    Best Of Breed. The proud Flowmaster seal says it all, the top pedigree in construction and materials with a robust 3.0-inch inlet and dual 2.5-inch outlet 16-gauge 409 stainless-steel tubing that can survive even the toughest challenge and environment. The Super 40 Series Delta Flow muffler bridges two 3.5-inch diameter polished stainless-steel tips. You’ve never seen such great looks or heard so much power.

    Easy Installation.It’s a worry-free/problem-free process all the way with the American Thunder Cat-Back. Featuring specially-engineered bolt-on set-up, the kit includes all the hardware to make this upgrade replacement for your stock F-150 exhaust seamless. Note, that your cab and bed size might require minor customization of the pipping but no major modifications should be expected.

    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.

    Fitment: 2015 2016 2017 2018 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
    Tech Specs
    Will it fit my F-150?

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    4 Questions / 3 Answers

    Ask a Question

    Can you leave the spare tire in original location after exhaust is installed?


    • The Flowmaster American Thunder Cat-Back Exhaust will allow the spare tire to remain in its stock location, and remain accessible.

      Rob D

    Helpful (1)

    Does this work with the integrated trailer brake controller? My 2016 has a bunch of hoses and stuff on the passenger side of the axle that I assume are part of the brake controller, that look like they would be right in the way of where the passenger side tailpipe would have to come through.


    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)

    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 (14) Write a Review

    Overall Rating 4.4

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.384615 4.4
    • Exhaust Note 4.846154 4.8
    • Fit & Finish 4.153846 4.2
    • Bang For Your Buck 4.307693 4.3

    • 5/5

      Installation Time: Afternoon

      May 24, 2018

      Good Fit

      Good kit and love the sound. Good thing with this kit is you don't have to remove your spare tire


      Year: 2015 Submodel: XLT Engine: 5.0L V8

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      May 19, 2018

      F150 5.0 Flowmaster

      This exhaust made my f150 5.0 sound great! Its sounds like the old fox body 5.0's i love it! The fitment is great with the optional side or rear exit. It turns heads everywhere i go.


      Year: 2018 Submodel: XLT Engine: 5.0L V8

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      April 12, 2018

      wife loves it

      believe it or not the Wife and Mother in law said they like my old truck better 1999 f150 5.4 [sound that is] so I installed this system both are smiling now thanks American truck


      Year: 2018 Submodel: XLT Engine: 5.0L V8

      Helpful (3)

    • 4/5

      January 03, 2018


      when i finally received everything it was good as expected


      Year: 2016 Engine: 5.0L V8

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      December 02, 2017

      awesome sound, easy install

      This set is all you could hope for. Easy install, great sound and, looks. I like how at idle there is a nice rumble, but just get on the throttle and they wake up. At highway speeds, you can hear the exhaust in the cab, but it's not annoyingly loud, and even at those speeds they wake up when you throttle the gas.


      Year: 2015 Submodel: XLT Engine: 5.0L V8

      Helpful (2)

    • 3/5

      Installation Time: Afternoon

      October 03, 2017

      OK.. but not as I expected..

      First I will have to agree with several other comments I saw about the band clamps -- I found it IMPOSSIBLE to get them tight enough to actually hold the pipes in place.. TWICE within a month I had to get under the truck - re adjust and fully seat all of the pipes again and re - tighten. Finally gave up and had them welded as again after a week started noticing the left tail pipe sagging down lower than the right... Also started noticing corrosion on the pipes almost instantly.. These do sound great, a touch louder than I wanted, yet not loud enough I cant stand them going down the highway.


      Year: 2016 Submodel: XLT Engine: 5.0L V8 Marysville, OH

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      September 21, 2017

      Music to my ears

      Great sound with my truck. Need two people to install if you don;t have access to a lift and have to jack up. Easy to follow instructions. Well worth the money. Only had one problem. Had to buy U clamps instead of using the ones in the kit. Could not get them tight enough.


      Year: 2015 Engine: 5.0L V8

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      September 02, 2017

      I remember the '70s!

      I'm getting a little lazy to install the exhaust myself, but, I had the new system installed for $100. I haven't had this much fun in a long time. My truck only has 200 miles on it and it sounds like a truck should sound. This exhaust adds personality to the truck that was missing.


      Year: 2017 Submodel: XLT Engine: 5.0L V8

      Helpful (4)

    • 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 Engine: 5.0L V8

      Helpful (2)

    • 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: XLT Engine: 5.0L V8 Newport News, VA

      Helpful (13)

    • 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!


      Engine: 5.0L V8

      Helpful (3)

    • 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.


      Engine: 5.0L V8

      Helpful (3)

    • 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


      Engine: 5.0L V8

      Helpful (4)

    • 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!


      Lincoln University, PA

      Helpful (6)

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