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Flowmaster American Thunder Stainless Steel Dual Exhaust System - Side/Rear Exit (04-08 5.4L F-150)

AmericanTrucks no longer carries the Flowmaster American Thunder Stainless Steel Dual Exhaust System - Side/Rear Exit (04-08 5.4L F-150).
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Features, Video & Details

  • Moderate Flowmaster Super 40 Series Tone
  • Durable 409 Stainless Steel Construction
  • 3 in. Inlet, Dual 2.5 in. Outlet Mandrel-Bent Tubing
  • 3 in. Polished Stainless Steel Tips
  • Bolt-On Installation; Some Trimming May Be Required
  • Choice of Side or Rear Exit
  • Made in the USA
  • Fits All 2004-2008 5.4L F-150s

Review & Installation Video

Review & Install Video

Demand Respect. There's nothing like the rumbling powerful sound of an aftermarket exhaust system like this one from flowmaster. It transforms a tame F-150 truck into a powerful beast that demands respect. Everywhere you drive you'll get looks of admiration for the tough sound your truck has, and it's due to this kit. The kit is designed with wide pipes and a special muffler for a controlled rumble that you can be happy with.

Go Faster. Stop driving with the same level of power that you've always had and charge your truck up to the next level with this Flowmaster 409S dual rear side cat-back exhaust. It's designed to maximize your truck's engine for tip-top performance. The kit has a large mid-pipe a straight-through muffler and two thick tail pipes. Together these elements come together and work along with a small number of bends to create a smooth flowing trail for exhaust to move through. This creates more power and performance that you can count on to make your truck really move well. You'll love the power that you have avialable to you with this kit installed.

It's Stainless Steel. This product is made entirely of stainless steel. The 16 gauge steel resists corrosion over time and delivers tough performance that stands out among all the products out there. There are few options that will hold up more capably than this tough stainless steel, which is why it makes sense to rely on the product and why you can count on the kit to hold up through heavy use.

No Cutting or Welding. Flowmaster designes this exhaust kit for simplicity. It can be put into position without welding or cutting requirements. That means with basic tools you can get your exhaust going the way you want it to be. It's impressive what you can do with the right resources and you won't take more than a few hours to get it all installed either.

Application. Fits 2004 to 2008 Ford F-150 and Lincoln Mark LT truck with a 4.6L or 5.4L engine, fits 2 and 4 wheel drive models and all wheelbases.

Fitment: 2004 2005 2006 2007 2008 Details

MPN# 817417

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Inlet Pipe
  • (1) Extension Pipe
  • (1) Muffler
  • (1) Right Tailpipe
  • (1) Front Left Tailpipe
  • (1) Rear Left Tailpipe
  • (2) Side Exit Pipes
  • (2) Rear Exit Pipes
  • (2) Stainless Tips
  • (1) Ring Clamp Hanger
  • (1) Rear Frame Hanger
  • (1) Rubber Hanger
  • (6) 2-1/2" Clamps
  • (2) 3" Clamps
  • (1) 5/16" x 1-1/4" Bolt
  • (2) 5/16" Flat Washers
  • (1) 5/16" Lock Washer
  • (1) 5/16" Nut
  • (2) 7/16" Hanger Keepers
Installation Info
Tech Specs
Will it fit my F-150?

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Customer Reviews (4) Write a Review

Overall Rating 4.5

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 4.25 4.3
  • Exhaust Note 4.75 4.8
  • Fit & Finish 4.75 4.8
  • Bang For Your Buck 4.5 4.5

  • 4/5

    Installation Time: Less than 1 Hour

    September 04, 2018

    Not too bad

    Easy install... Louder than expected and took a bit to adjust. Easier with 2 people but can be done by yourself, just takes more time to adjust


    Year: 2007 Submodel: FX4 Engine: 5.4L V8

    Helpful (8)

  • 4/5

    Installation Time: Afternoon

    December 07, 2017

    Love the difference

    The hardest part was to take off the factory system. The exhaust fit well with the exception of the inlet hanger. It would not mount into the factory mount. Overall I am very pleased with the change. Not as loud as I expected, but I am happy with it. Definite difference in my engine performance.


    Year: 2004 Submodel: Lariat Engine: 5.4L V8

    Helpful (11)

  • 5/5

    Installation Time: Afternoon

    June 27, 2017


    Everything fit just as advertised no problem installing hardest part was removing the original factory system


    Year: 2004 Engine: 5.4L V8

    Helpful (8)

  • 5/5

    Installation Time: Weekend

    November 09, 2016

    It is amazing

    Looks and sounds great easy install for diy fits great


    Engine: 6.2L V8 Raptor

    Helpful (7)