HSP Diesel 2004.5-2005 LLY Duramax Max Flow Bridge to Factory Cold Side - 206-HSP

HSP LLY Y-Bridge Kit to Factory Cold Side for 2004.5–2005 Duramax

Part Number: 206-HSP

The 206-HSP HSP Max Flow Bridge to Factory Cold Side is a bolt-on LLY Y-bridge upgrade for 2004.5–2005 Chevrolet and GMC Duramax trucks. This LLY Duramax Y-bridge kit is designed to increase airflow and reduce boost leaks while retaining compatibility with the OEM factory cold side tube.

Why Upgrade to an LLY Y-Bridge?

The factory bridge on the 2004.5–2005 LLY Duramax can become a restriction as airflow demand increases. An upgraded Y bridge for LLY Duramax improves flow to support better throttle response and turbo spool-up, while also addressing common sealing issues that can lead to boost leaks.

What Makes the HSP Y Bridge for LLY Duramax Different?

HSP designed this LLY Y bridge as a 3-inch precision-cast and CNC-machined two-piece bridge that connects to the stock cold side system. The two-piece construction helps simplify installation, improves sealing, and delivers a noticeable airflow improvement compared to the OEM bridge setup.

What’s Included

• 1x Bridge Neck (HSP-IN-209)
• 1x Bridge (HSP-IN-222)
• 1x Bridge Neck O-Ring (RFB-670-RFAB)
• 1x 1/8" NPT Brass Plug (RFB-811-RFAB)
• 2x Bridge Neck Stud (RFB-902-RFAB)
• 2x Bridge Neck 12-Point Nut (RFB-903-RFAB)
• 24" 5/8" Heater Hose (RFB-401-RFAB)
• 2x 5/8" Worm Gear Clamp (RFB-403-RFAB)
• 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)

Note: The 8th character of the VIN designates engine code; the 10th character identifies the model year.

Overview

• LLY Duramax Y-bridge kit designed to work with the factory cold side tube
• Improved airflow for better performance and turbo spool-up
• Two-piece design for easier install and improved sealing
• 3-inch diameter bridge for increased flow
• Precision-cast and CNC-machined construction
• Powder coating options for a clean engine bay appearance

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we stand behind every part that leaves our facility. Our No BS Limited Lifetime Warranty is built around straightforward support, clear terms, and a simple process designed to keep you on the road.

Click here to learn more about our Lifetime No BS Warranty