Intercooler Pipe & Boot Kit for GMC Sierra (2002-2004) 6.6L Duramax LB7

Heavy-Duty Intercooler Pipe & Boot Kit for 2002-2004 GMC Sierra (GMT800)

What it Does: The Intercooler Pipe & Boot Kit replaces the fragile factory charge pipes and rubber couplers on the 2002-2004 Sierra to eliminate boost leaks, stabilize exhaust gas temperatures, and maintain manifold pressure under heavy load.

The Stock GMC Sierra Charge Air System Weakness

Factory charge air couplers on the GMT800 platform equipped with the LB7 Duramax degrade rapidly under routine thermal cycling and oil vapor exposure from the crankcase ventilation system. The original thin-wall rubber hoses harden, swell, and split along flex seams, while OEM worm-gear clamps lose clamping force under heat. This degradation causes severe boost loss, elevated exhaust gas temperatures (EGTs), excessive soot output, and turbocharger overspeeding under load.

The Engineering Solution

This kit upgrades the entire boost tract using mandrel-bent 3-inch aluminum piping finished with an electrophoresis coating to resist underhood heat and corrosion. The mandrel-bent profile eliminates factory airflow restrictions for steady pressure velocity. Heavy-duty multi-ply silicone boots provide superior resistance to oil saturation and thermal fatigue, secured by constant-tension stainless steel T-bolt clamps to eliminate blow-offs at both stock and elevated boost levels.

What's Included

• 1x Mandrel-Bent Hot-Side Intercooler Pipe (3-Inch)
• 1x Mandrel-Bent Cold-Side Intercooler Pipe (3-Inch)
• 2x Multi-Ply Silicone Transition Boots (2.30" to 3.00")
• 2x Multi-Ply Straight Silicone Boots (3.00")
• 3x 2.75-Inch Stainless Steel T-Bolt Clamps
• 6x 3.25-Inch Stainless Steel T-Bolt Clamps

Technical Specifications

Compatibility

• 2002-2004 GMC Sierra 2500 HD (6.6L V8 LB7 Duramax Turbo Diesel)
• 2002-2004 GMC Sierra 3500 (6.6L V8 LB7 Duramax Turbo Diesel)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT800 Sierra?

Yes, this is a direct fit for the 2002-2004 GMC Sierra equipped with the 6.6L LB7 Duramax engine. Does not fit 2004.5-2005 LLY Duramax models.

Will this kit hold up on tuned applications?

Yes, the 3-inch rigid aluminum tubing and high-strength multi-ply silicone boots with T-bolt clamps are engineered to reliably handle higher manifold pressures than stock.

The GMC Heavy-Duty Standard

Designed specifically to handle severe-duty hauling and towing demands, this charge pipe system restores boost integrity, safeguards turbocharger efficiency, and ensures long-term operational durability.