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This Gibson 618815 cat-back single exhaust system upgrades 2004-2023 Toyota 4Runner models with a 4.0L V6 engine. Single side exit behind the rear tire boosts acceleration, hill climbing, towing and passing power through dyno-proven low-end torque and horsepower from 1800-3000 RPM. Average gains of 10-15 horsepower and 15-20 lb-ft torque make it ideal for daily driving and off-road demands.
Key Features
- Single Side Exit: Positions outlet behind rear tire for balanced flow and aggressive sound without drone inside the cab.
- Bolt-On Installation: Direct fit using factory mounting points with no welding or cutting required for professional results.
- Stainless Steel Construction: 409-grade tubing and polished tips resist corrosion for long-lasting durability and mirror finish.
- Quiet Cabin: Engineered muffler design keeps interior noise lower than other performance exhaust options while delivering deep tone outside.
- Bolt-on design reuses OEM hangers and clamps for 1-2 hour install.
- Precision mandrel-bent tubing ensures smooth exhaust flow and fitment.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2003-2024 | Toyota | 4Runner | 4.0L |
Specifications
| Manufacturer | Gibson |
|---|---|
| Manufacturer Part Number | 618815 |
| Product Type | Catback |
| Fitment Type | Vehicle specific |
| Tubing Diameter | 2.50-in. 409 Stainless mandrel bent tubing. |
| Tip Description | 4in. Polished T304 Stainless Rolled Slash- Cut Tip. |
| Tip Specification | Inlet 2.50in., Outlet 4.0 in., L-12in. |
| Muffler Description | Baffled &, Chambered Design, No internal Packing, Minimal Interior Drone, Aggressive Sound |
| Muffler Dimension | 6 in. Round, 2.50 in. Offset Inlet, 2.50 in. Offset Outlet, L-24 in. |
| Additional Description | Includes all hardware and factory style hangers for easy bolt on installation. |
| Exit Position | Exit Is Straight Out The Back. |
| Warranty | Lifetime Limited Warranty |
What's Included
- One new Gibson catback in the exact configuration identified by manufacturer part number 618815
- Hardware and accessories only when supplied for this exact part number
About Gibson
Gibson develops vehicle-specific and universal exhaust components for street, truck, SUV, and performance applications. Selection and installation requirements remain exact-part-number specific.
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Frequently Asked Questions
Which vehicles fit Gibson GIB618815?
Gibson GIB618815 is listed for 2003-2024 Toyota 4Runner. Confirm the exact engine, trim, drivetrain, body or cab configuration, exhaust layout, and every application note before ordering.
What should I verify before ordering Gibson GIB618815?
Match the exact part number, system type, material, finish, tubing and connection diameters, exhaust configuration, package contents, and current manufacturer notes shown in this listing.
What should be checked when installing Gibson GIB618815?
Verify all interfaces, hanger positions, tip and body clearances, clamp or fastener torque, leak-free operation, and local emissions requirements. Reinspect the system after its first heat cycle.
Installation Instructions
Follow the current Gibson instructions and vehicle service information for this exact part number. Work on a cool exhaust, support the vehicle safely, confirm all interfaces and clearances, align the system before final tightening, test for leaks, and inspect the installation again after the first heat cycle.
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