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Truck and Jeep Parts Home » Performance Parts » Exhaust System Kits » Flowmaster American Thunder Cat Back Exhaust System - 817674

Flowmaster American Thunder Cat Back Exhaust System - 817674

Flowmaster Exhaust | Part Number: FLW817674
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Part Number: FLW817674
  • Technical Details

    • Single Rear Exit
    • 2.5 in. Tubing
    • Super HP-2 Muffler
    • 3 in. Pol. Stainless Steel Tip

Flowmasters new American Thunder cat-back system for the Jeep Wranglers is perfect for the person looking for maximum performance and ground clearance from their exhaust system. This 2.50" system features a 409S stainless steel mandrel bent tailpipe with a 3.00" polished stainless steel tip and fits both 2 and 4 door models with the 3.6L and 3.8L V6 engines. This system replaces the factory transverse muffler and relocates the Super HP-2 muffler behind the factory catalytic converter, providing a moderate to aggressive sound level. This relocation allows for better ground clearance when driving off-road. Because the tailpipe is tucked up so high, an aftermarket metal bumper is recommended. The exhaust system is manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.

Installation instructions are in PDF format. You will need Adobe Reader to view these files.
Download Instructions

FitmentSystem TypeMaterialTubing SizeExit Location/TypeTip Included
Direct FitCat-BackStainless Steel2.5 InchesSingle Turndown After Muffler Tip is included

Customer Reviews

Average Customer Review

Installed on 2014 JK Rubicon X



from Denver, CO


Comments about Flowmaster ExhaustAmerican Thunder Cat Back Exhaust System:

So I installed this on a 2014 JKRX about a month ago and I have been waiting to post a review. The sound and ground clearance is awesome! My mileage has dropped 2 - 4 MPG and I am not driving it with a heavy foot due to the better sound of this system over stock. The install took way too long as it seemed that I was the first person (according to Flowmaster tech support) which struggled with a two

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Questions & Answers

  • Q:

    "Is this exhaust street legal in North Carolina? Chris 08 Jeep Wrangler Unlimited"
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