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Upgrade your Hummer H3 with the Gibson cat-back dual split exhaust system designed for 2006-2010 Base models with 3.7L engine and 2007 X. This aluminized steel exhaust reduces backpressure to deliver more torque and average horsepower gains of 15-20. Enjoy an aggressive throaty sound and striking rear-exit look with stainless tips.
Key Features
- 2.5-Inch Mandrel-Bent Tubing: Aluminized steel construction ensures smooth exhaust flow and durability for consistent performance.
- Stainless Steel SuperFlow Mufflers: Provide deep throaty tone that intensifies under load or towing without drone.
- Dual Split Rear-Exit Tips: Polished stainless 3.5-inch tips exit straight out the back for a custom aggressive appearance.
- Bolt-On Design: Uses factory mounting points for straightforward setup with no cutting or welding.
- Proven Power Gains: Dyno-tested increases of 15-20 horsepower and added torque through reduced restriction.
- Complete bolt-on process takes 1-2 hours using provided clamps and hangers.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2006 | Hummer | H3 | 3.5L |
| 2007-2010 | Hummer | H3 | 3.7L |
Specifications
| Manufacturer | Gibson |
|---|---|
| Manufacturer Part Number | 312700 |
| Product Type | Catback |
| Fitment Type | Vehicle specific |
| Tubing Diameter | 2.50-in.Aluminized mandrel bent tubing. |
| Tip Description | 3.50in. Polished T304 Stainless, Round Slash- Cut Tip, Clamp on. |
| Tip Specification | Inlet 2.50in., Outlet 3.50in., L-6.5in. |
| Muffler Description | Baffled &, Chambered Design, No internal Packing, Minimal Interior Drone, Aggressive Sound |
| Muffler Dimension | 7 in. Round, 2.50 in. Center Inlet, 2.50in. Dual 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 312700
- 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 GIB312700?
Gibson GIB312700 is listed for 2006-2010 Hummer H3. 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 GIB312700?
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 GIB312700?
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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