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This Gibson single side cat-back exhaust system enhances acceleration, hill climbing, towing and passing power on Toyota 4Runner models. Fits 2004-2023 4.0L V6 including Limited, SR5, TRD Pro, TRD Off-Road and more with single exit behind rear tire. Dyno tests confirm peak torque and horsepower at 1800-3000 RPM for average 10-15 HP and 15-20 lb-ft torque increases.
Key Features
- Power Gains: Dyno proven 10-15 horsepower and 15-20 lb-ft torque increases focused on low-end RPM for real-world driving.
- Exit Design: Single side exit positioned behind rear tire for clean appearance and balanced flow.
- Easy Bolt-On: Direct hassle-free installation with no welding or cutting required using factory mounts.
- Cabin Comfort: Quieter inside the vehicle compared to other performance exhaust options.
- 2.5-inch mandrel-bent tubing diameter throughout for unrestricted flow.
- Polished 4-inch stainless steel tip included for style.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2003-2024 | Toyota | 4Runner | 4.0L |
Specifications
| Manufacturer | Gibson |
|---|---|
| Manufacturer Part Number | 18815 |
| Product Type | Catback |
| Fitment Type | Vehicle specific |
| Tubing Diameter | 2.50-in.Aluminized 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 18815
- 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 GIB18815?
Gibson GIB18815 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 GIB18815?
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 GIB18815?
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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