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Flowmaster American Thunder Dual Exhaust System - Side/Rear Exit (07-13 5.3L Silverado 1500)

AmericanTrucks no longer carries the Flowmaster American Thunder Dual Exhaust System - Side/Rear Exit (07-13 5.3L Silverado 1500). Please check out 2007-2013 Silverado 1500 Exhaust Systems for an updated selection.

Features & Details

  • Moderate Internal and Aggressive External Sound Levels
  • Designed to Improve Scavenging and Airflow to Increase Horsepower and Torque
  • Delta Flow™ Super 40 Series Muffler with Welded Baffles
  • Has 2.5 in. Double Mandrel Bent Stainless Steel Tubing
  • Comes with 3.5 in. Polished Stainless Steel Double-Walled Exhaust Tips
  • Split Side Exits Behind the Rear Wheels or Dual Rear Exits
  • Bolt-On Installation
  • Fits 2007 to 2013 Chevrolet Silverado 1500 5.3L Models
Delivers Powerful Aggressive Sound. The Flowmaster American Thunder Cat-Back Exhaust is designed to deliver a race-inspired powerful and aggressive sound externally. Additionally, Flowmaster engineered the exhaust to deliver a milder, moderate sound level inside the cab for a more comfortable ride. And as a bonus, the exhaust exit can be configured for either split side or dual rear exits for flexible customization.

Improves Performance. Flowmaster’s Delta Flow technology was primarily designed to vastly improve scavenging which in addition to the efficient exhaust flow of the double mandrel-bent tubing significantly increases performance. Enjoy improved horsepower, torque, and mileage.

Durable Construction. The American Thunder is made from premium material to ensure durability and long-lasting service. Flowmaster’s precision-machined mandrel bent tubing is designed for the smoothest airflow and best possible sound levels.

All Bolt-On Installation. The American Thunder Cat-Back Exhaust is designed to make the installation process as simple as possible. While not required, Flowmaster recommends welding all slip-fit connections for a more secure installation.

Application. The Flowmaster American Thunder Cat-Back Exhaust with split side or rear exits is designed to fit 2007 to 2013 Chevrolet Silverado 1500 5.3L Models.

Fitment: 2007 2008 2009 2010 2011 2012 2013 Details

MPN# 817680

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Inlet Pipe
  • (1) 07-08 Adapter
  • (1) 09-13 Adapter
  • (1) 8.0 ft. Bed Extension
  • (1) Muffler
  • (1) Tailpipe, Right
  • (1) Tailpipe, Left Front
  • (1) Tailpipe, Left Rear
  • (2) Side Exit Pipes (Right and Left)
  • (2) Rear Exit Pipes (Right and Left)
  • (2) Stainless Tips
  • Installation Hardware
Installation Info
Tech Specs
Will it fit my Silverado 1500?

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        Customer Reviews (1) Write a Review

        Overall Rating 4

        out of 5 stars

        Installation Time:Afternoon

        • Loudness / Volume 4 4
        • Exhaust Note 5 5
        • Fit & Finish 4 4
        • Bang For Your Buck 5 5

        • 4/5

          Installation Time: Afternoon

          June 15, 2018

          Sounds great easy to install

          Sounds awesome. Was easy to install. Just make sure you have the pipes pused together all the way or you might get a bit of a leak. Wasn't as loud as I expected but that may change after I use it for a bit. Very well made product iv used cheaper cat backs in the past and they are never bent right can't say that about this system. Well worth the money.


          Year: 2009 Submodel: LT Engine: 5.3L V8

          Helpful (3)

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