Description
Overview
The Flowmaster Outlaw Extreme Cat-Back Exhaust System is engineered to bring serious flow, aggressive sound, and off-road-ready packaging to the 2003-2024 Toyota 4Runner equipped with the 4.0L engine. Built around Flowmaster’s Outlaw series muffler, this cat-back system delivers a deep, powerful tone paired with increased performance, making it a standout upgrade for drivers who want their 4Runner to sound as capable as it looks.
At the heart of the system is 3.0-inch mandrel-bent 409 stainless steel tubing. The mandrel bends preserve a consistent internal diameter through every curve for maximum exhaust flow, while the 409 stainless construction adds long-term durability against heat and corrosion. The Outlaw muffler measures 40.00 inches in overall length with a center inlet and a 3.00-inch outlet, and it’s finished in black for a rugged, purpose-built appearance against the silver-finished piping.
Built for the Trail
What sets the Outlaw Extreme apart is its turndown-style dump exit positioned right after the muffler. By eliminating the traditional over-axle tailpipe, this design improves ground clearance and departure angle — a meaningful advantage when you’re tackling more extreme off-road situations. Less hardware hanging low means fewer obstacles between your rig and the terrain.
Easy, Bolt-On Installation
Flowmaster designed this system to use factory mounting locations and factory hangers, and all of the necessary hardware is included in the kit. That means a straightforward installation without the need to fabricate or relocate mounting points, so you can get your 4Runner back on the road — or the trail — faster.
- 3.0-inch mandrel-bent 409 stainless steel tubing for maximum flow and durability
- Outlaw series muffler (40.00″ overall length, center inlet, 3.00″ outlet) for a deep, aggressive tone
- Turndown dump exit eliminates the over-axle tailpipe to improve ground clearance and departure angle
- Single tailpipe configuration with a black muffler and silver pipe finish
- Uses factory hangers and mounting locations with all necessary hardware included
- CARB (California) compliant, Emission Code 5
Fitment
This cat-back system is designed specifically for the 2003-2024 Toyota 4Runner with the 4.0L engine. The kit includes the Outlaw muffler; exhaust tips are sold separately, allowing you to finish the system to match your preferred style. Configure your setup with the tip that fits your build.
Sound & Performance
Expect an aggressive sound profile that announces the 4.0L’s presence while the free-flowing 3.0-inch tubing supports increased performance. The combination of the Outlaw muffler and mandrel-bent stainless tubing delivers the deep, powerful character that has made Flowmaster a trusted name in performance exhaust.
The Flowmaster Outlaw Extreme Cat-Back Exhaust System is backed by Flowmaster’s Lifetime Limited Warranty.
