Description
Overview
The Flowmaster Flow FX Extreme Cat-Back Exhaust System is a purpose-built stainless steel upgrade for the 2018-2026 Jeep Wrangler JL equipped with the 3.6L engine. Engineered around Flowmaster’s Flow FX series muffler, it delivers a deep, powerful, and unapologetically aggressive tone while adding measurable performance gains and rugged off-road practicality. If you want your JL to sound as capable as it looks on the trail, this Extreme cat-back is designed to do exactly that.
At the heart of the system is 3.0-inch mandrel-bent 409 stainless steel tubing. The mandrel bending process maintains a consistent inner diameter through every curve for maximum exhaust flow, while the 409 stainless construction stands up to heat, moisture, and the abuse of demanding driving conditions. The Flow FX series muffler measures 25.20 inches overall with a center inlet and center 3.00-inch outlet, tuned to produce that signature Flowmaster growl without excessive drone.
Performance and Off-Road Design
Beyond sound, the Flow FX Extreme is built to add power where it counts. It delivers gains of up to 12 horsepower and 13 lbs-ft of torque at the rear wheels, freeing up the 3.6L engine to breathe more efficiently. What truly sets this system apart is its turndown-style dump exit positioned right after the muffler. By exiting the exhaust immediately instead of routing an over-axle tailpipe, the design eliminates that hardware entirely, improving ground clearance and departure angle for more aggressive off-road situations. Less pipe hanging low means fewer obstacles to catch when you push your Wrangler into extreme terrain.
Easy, Bolt-On Installation
This is a complete cat-back kit that includes the Flow FX muffler and all necessary hardware. It utilizes the factory mounting locations and stock hangers, making for a straightforward, bolt-on installation without the need for cutting, welding, or fabrication. The silver-finished muffler and tubing give the system a clean, uniform appearance underneath your JL.
- Fits 2018-2026 Jeep Wrangler JL with the 3.6L engine
- 3.0-inch mandrel-bent 409 stainless steel tubing for flow and durability
- Flow FX series muffler for a deep, powerful, aggressive sound
- Gains of up to 12 hp and 13 lbs-ft of torque at the rear wheels
- Turndown dump exit eliminates the over-axle tailpipe for better ground clearance and departure angle
- Single tail pipe configuration with center inlet and 3.00-inch center outlet
- Uses factory hangers and includes all necessary hardware
- CARB (California) compliant, Emission Code 5
Backed for the Long Haul
The Flow FX Extreme cat-back is CARB compliant, so it meets California emissions requirements, and it is backed by Flowmaster’s Lifetime Limited Warranty. That combination of performance, durability, trail-ready design, and long-term protection makes it a smart, worry-free upgrade for JL owners who demand more from their exhaust.
