6.6L Duramax LLY Intercooler Hose Kit | 2004.5-2005

LLY Silicone Intercooler Hose Kit

A silicone intercooler hose kit for the 2004.5–2005 GM 6.6L Duramax LLY engine replaces weak, degrading factory rubber boots with reinforced, multi-ply silicone to prevent boost leaks and blowouts under high heat and pressure.

Built to handle high heat, pressure, and demanding diesel conditions, these intercooler hoses help reduce boost leaks, maintain consistent airflow, and support a more dependable turbo diesel experience while extending the life of your intake system.

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Compatibility

• Years: 2004.5-2005
• Makes: Chevrolet Silverado, GMC Sierra
• Models: 2500HD, 3500HD
• Engine: 6.6L Duramax LLY (diesel)
• Body: Pickup

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Key Features

• Multi-Layer Silicone That Lasts: These aren’t your average hoses. They’re layered up to handle high heat and boost without ballooning, cracking, or turning soft over time.
• Oil-Resistant Material: Diesel engines see oil in the intake all the time. These hoses are built to resist oil breakdown, so you’re not chasing leaks every few months.
• Drop-In Fit: No cutting, no custom mods—these hoses are shaped to match your stock setup. Bolt 'em in and go.
• Heavy-Duty T-Bolt Clamps Included: You’ll get the right clamps in the box, strong enough to hold boost even when you're pushing hard.

Why Bother Upgrading?

Stock rubber hoses? They don't age well. Over time, they dry out and crack—which leads to boost leaks, lower power, hotter EGTs, and wasted fuel. If you're noticing a loss in performance, this might be why. This silicone hose kit seals things back up and stays that way. Even tuned trucks benefit big time from the extra durability and airflow consistency.

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Install in No Time

No need for shop tools or fabrication. This kit installs using basic hand tools, and everything you need is in the box—hoses, clamps, and a clean fit. You'll spend less time under the hood and more time driving.

If you're ready to ditch the stock rubber for something stronger, this Silicone Intercooler Hose Kit is it. You’ll get better airflow, less hassle, and the kind of durability that just makes sense for any Duramax running hard.