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The Gibson 612501 Cat-Back Single Exhaust is built specifically for the 2008–2009 Hummer H2 6.2L. It features 3.5 inch 409 stainless mandrel-bent tubing and Gibson’s SuperFlow muffler, delivering dyno-proven gains of 10 to 15 horsepower and 15 to 20 lb-ft of torque , with the strongest improvements in the 1,800 to 3,000 RPM range the power band most used during towing, hill climbing, and highway passing.
Key Features
- Position the 4 inch tip and tighten all clamps.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2007 | Hummer | H2 | 6.0L |
| 2008-2009 | Hummer | H2 | 6.2L |
Specifications
| Manufacturer | Gibson |
|---|---|
| Manufacturer Part Number | 612501 |
| Product Type | Catback |
| Fitment Type | Vehicle specific |
| Tubing Diameter | 3.5-in. 409 Stainless mandrel bent tubing. |
| Tip Description | 4in. Polished T304 Stainless, Round, Slash- Cut Tip, Clamp on. |
| Tip Specification | Inlet 3.50 in., Outlet 4 in., L-12 in |
| Muffler Description | Baffled &, Chambered Design, No internal Packing, Minimal Interior Drone, Aggressive Sound |
| Muffler Dimension | 4 x 9 x 18 in. Oval Body, 3.50 in. Center Inlet, 3.50 in. Center Outlet. |
| 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 612501
- 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.
Related Gibson Products
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- Gibson 2008 Hummer H2 Base 6.2L 2.25in Cat-Back Dual Sport Exhaust - Black Elite
- Gibson 14-19 Cadillac Escalade Base 6.2L 3.5in/2.25in Cat-Back Dual Extreme Exhaust - Aluminized
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Frequently Asked Questions
Which vehicles fit Gibson GIB612501?
Gibson GIB612501 is listed for 2007-2009 Hummer H2. 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 GIB612501?
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 GIB612501?
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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