HSP Diesel 2004.5-2005 LLY Duramx Cold Side Tube to Factory Bridge - 205-HSP

HSP Cold Side Tube to Factory Bridge for 2004.5-2005 Chevrolet / GMC Duramax LLY

The 205-HSP, also known as the HSP Cold Side Tube to Factory Bridge, is designed specifically for 2004.5-2005 LLY Duramax-equipped Chevrolet and GMC trucks. This cold side tube is perfect for owners upgrading their factory components while retaining the stock bridge.

Why Choose the HSP Cold Side Tube to Factory Bridge?

The factory charge air system in the LLY Duramax is highly restrictive, especially the cold side tubing. HSP Diesel identified that the OEM design left significant performance gains on the table. As understanding of airflow and engine potential evolved, it became clear that the LLYs stock system needed improvement—starting with airflow volume.

What Makes This Tube Different?

This HSP Cold Side Tube increases the diameter to 3", a substantial jump from stock. It also features sweeping mandrel bends designed to minimize turbulence and maximize airflow. The result? Up to 53% more flow than the factory unit. While upgrading the entire charge air system is ideal, this tube is a strong standalone improvement and a great first step.

What's Included

• 1x Coldside Tube (HSP-IN-213)
• 1x 2.25" T-Bolt Clamp (RFB-420-RFAB)
• 1x 3" T-Bolt Clamp (RFB-422-RFAB)
• 1x 2.25" to 3" Reducer Boot (RFB-441-RFAB)

Fitment

• LLY: 2004.5-2005 (VIN Code 2)

How to identify VIN Code: The 8th character of the VIN indicates the engine code. The 10th character indicates the model year.

Overview

• 3" mandrel-bent aluminum tubing
• Designed to fit the factory bridge
• Up to 53% increased airflow over stock
• Improved turbo spool-up and throttle response
• Powder coat finish options for enhanced engine bay appearance

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we believe in the quality of our products and stand firmly behind everything we manufacture. For years, we've gone above and beyond for our customers—now we're making it official. Our No BS Warranty clearly outlines the coverage, process, and expectations so you can buy with confidence.

Click here to read our full Lifetime No BS Warranty