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Flowmaster American Thunder Direct-Fit Muffler (09-18 5.7L RAM 1500)

Market Price $452.99 You Save 12% ($52.81)
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$400.18 (each)

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  • Item R103097
  • MPN# 817568

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    Features, Video & Details

    • Muffler
    • Enhanced Performance
    • Quality Design
    • Custom Fit
    • Limited Lifetime Warranty
    • Fitment On All 2009-2018 5.7 L Dodge RAM 1500 Trucks

    Review & Installation Video

    Review & Install Video

    Increased Operation. The Flowmaster American Thunder Direct-Fit Muffler gives your truck that big power feel with an exhaust system that is tuned to your truck. You’ll enjoy the sound that this assembly provides and the improved ride quality from your powertrain with the added throttle response and horsepower.

    Premium Engineering. The development of the Flowmaster American Thunder Direct-Fit Muffler uses a durable construction that incorporates stainless components. The tubing on the exhaust is 3 in. in diameter for heavy-duty operation. Dyno tuning is also included so your engine operatives efficiently with the placement of this exhaust system.

    Direct Install. The Flowmaster American Thunder Direct-Fit Muffler was created to be easy to install on your truck. It includes everything you need for attachment and all inlet pipes and hangers have been pre-welded to save you even more time. 

    Limited Lifetime Warranty. The Flowmaster American Thunder Direct-Fit Muffler is backed by a limited lifetime warranty. There are some exclusions to consider. See Flowmaster for more information.

    Application. The Flowmaster American Thunder Direct-Fit Muffler can be outfitted on all 2009-2018 Dodge RAM 1500 truck models powered by a 5.7L engine.

    Fitment: 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) Muffler
    • Mounting Hardware
    Installation Info
    Will it fit my Ram?

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    Customer Reviews (2) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Less than 1 Hour

    • 5/5

      Installation Time: Less than 1 Hour

      October 15, 2018


      Flowmaster has really produced a good and effective product. The American Thunder on my 2017 RAM 1500 really opened up the responsiveness of the engine. It certainly has opened up the exhaust flow to allow the engine to exhale better. Torque is almost instantaneous when I need it; whether I'm taking off from a red light or traveling at speed. I have to mention that I also have a Pedal Commander installed and replaced the factory air filter with one from KandN (not a cold air intake just the filter element). I don't believe that a CAI would improve the air intake much more than just replacing the filter. The per square inch area is not that much greater on an CAI. With this setup I can maintain a lower noise level from the engine at WOT (wide open throttle) and get almost the same effect. I can even say that the transmission shifts are smother and more precise in its downshifting as well. If you really don't care about noise the Outlaw is probably your thing. If noise is an issue for you go with the Force II it is much quieter. The American Thunder does rumble and produces cabin noise if your motor is revving over 2500 RPM. Highway driving may not be so bad but towing is a bit strenuous on the ears. Overall it makes for a much more fun driving experience and I really like it. For the RAM 1500 5.7l the direct fit is just fine. You really would be wasting your money if you bought the cat-back system. You already have a dual exhaust. If you really must let me tell you that the power gain is not going to be much better and you would never feel or realize it if the vehicle has 5 more HP and maybe 3.5 more LBS of torque. For now I'm enjoying it and I hope this helps in you search for an exhaust upgrade.


      Year: 2017 Submodel: Laramie Longhorn Engine: 5.7L V8

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 28, 2018

      Great purchase

      This was easy to install took 10 min sound is awesome


      Year: 2016 Submodel: SLT Engine: 5.7L V8

      Helpful (3)

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