Flowmaster 817674 American Thunder Cat-back Exhaust System
- 2007-2014 Jeep Wrangler, 2 and 4 door
- 3.6L and 3.8L V6 engines
- 2.50 inch 409S stainless mandrel bent tailpipe
- 3.00 inch polished stainless tip
- Super HP-2 muffler relocated, moderate to aggressive sound
- Lifetime Limited Warranty, 23.5 pounds
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A cat-back system for the Wrangler that moves the muffler up for ground clearance and gives a moderate to aggressive sound. An aftermarket metal bumper is recommended.
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ASIN: B00FMN7V0WModel: 817674Category: Cat-Back Systems
Overview
Not a loud race pipe, this American Thunder cat-back replaces the factory transverse muffler and mounts a Super HP muffler behind the catalytic converter. The tailpipe is stainless and tucked up high.
The relocation helps off-road clearance, which is the reason to choose it. The tailpipe tucks up so high that Flowmaster recommends a metal bumper. All parts and hardware are included, and the system is made in the USA.
Who it's for
A Wrangler owner with the V6 who wants a sportier tone and better clearance will use all of it. Drivers who want stock sound, or who keep the plastic rear bumper, should look elsewhere.
Pros and cons
- Muffler relocation improves ground clearance
- 409S stainless mandrel bent tailpipe
- Polished stainless tip
- All hardware included
- Metal bumper recommended
- Sound is moderate to aggressive
- Only the V6 Wrangler years listed
Performance notes
Moving the muffler behind the catalytic converter frees space under the rear and gives a moderate to aggressive tone. The mandrel bent tube holds its diameter through the bends. The listing gives no horsepower figures.
Where it stands among cat-back systems
- #7 most-searched brand and model of the 12 cat-back systems lines we track (by search demand, not sales).
From the specs of the 15 cat-back systems we list; not a test result.
Specifications
| Brand | Flowmaster |
|---|---|
| Model | 817674 |
| Dimensions & fit | |
| Pipe diameter | 2.50 inches |
| Tip diameter | 3.00 inches, polished stainless |
| Item weight | 23.5 pounds |
| Construction & materials | |
| Material | 409S stainless steel, mandrel bent |
| Included components | |
| Included | All necessary parts and hardware |
| Warranty & support | |
| Warranty | Lifetime Limited Warranty |
| Other details | |
| Fit type | Vehicle Specific Fit |
| Fits | 2007-2014 Jeep Wrangler, 2 and 4 door, 3.6L and 3.8L V6 |
| Sound level | Moderate to aggressive |
| Muffler | Super HP-2 |
Frequently asked questions
What is in the box with the Flowmaster 817674?
The listing says the system includes all necessary parts and hardware for installation.
Which Wranglers does it fit?
2007-2014 models, 2 and 4 door, with the 3.6L and 3.8L V6.
Do I need a different bumper?
The listing recommends an aftermarket metal bumper because the tailpipe is tucked up so high.
How loud is it?
The listing says moderate to aggressive.