HSP Diesel 2011-2016 LML Duramax Max Flow Bridge/Cold Side Tube/Turbo Inlet - 504-HSP

HSP Max Flow Bridge / Cold Side Tube / Turbo Inlet for 2011-2016 Chevrolet / GMC Duramax LML

Part Number: 504-HSP

The 504-HSP is best known as the HSP Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle for the 2011-2016 LML Duramax-equipped Chevrolet and GMC trucks. This all-in-one performance bundle transforms airflow and overall efficiency — a must-have for any serious LML owner.

What Is the Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle?

The factory LML Duramax intercooler piping severely limits airflow, choking performance. The HSP Max Flow Bundle corrects this by increasing both air volume and velocity, which translates to noticeable power gains and improved engine response.

Max Flow Bridge Benefits

This isnt just any bridge. HSP Diesel engineered the Max Flow Bridge to port-match the intake runners, improving flow and boosting efficiency. The precision build and high-quality finish ensure both performance and durability.

Cold Side Tube Advantages

Factory cold side pipes are restrictive and failure-prone. HSP replaces this with a mandrel-bent aluminum tube that delivers smoother airflow and enhanced reliability. Designed to handle higher boost levels and look sharp while doing it.

Intake Mouthpiece Features

Custom-built and flow-optimized, the included VGT Intake Mouthpiece is hand-fabricated for ideal airflow transition. It ties the entire system together while offering optional powder coat finishes for a polished engine bay.

Whats Included

• 1x Bridge (HSP-IN-223)
• 1x Coldside (HSP-IN-228)
• 1x Fabricated Turbo Inlet (HSP-IN-216-2)
• 1x 1/8'' NPT Brass Plug (RFB-811-RFAB)
• 1x M6x1.0x16mm Flange Bolt (RFB-893-RFAB)
• 1x Duramax Pre-Made Hose - Rubber (RFB-398-RFAB)
• 1x 5/8" Worm Gear Clamp (RFB-403-RFAB)
• 1x 1/2" Worm Gear Clamp (RFB-405-RFAB)
• 60x 5/8" PCV Hose (RFB-407-RFAB)
• 4x 3" T-Bolt Clamp (RFB-422-RFAB)
• 2x 3"x4" Straight Boot (RFB-430-RFAB)
• 1x 3/4" to 5/8" Heater Hose Connector (RFB-462-RFAB)
• 1x 3/8" Coolant Plug - Aluminum (RFB-808-RFAB)
• 1x Rear Cover Coolant Fitting (RFB-809-RFAB)
• 1x Coolant Plug O-Ring (RFB-813-RFAB)
• 2x M6x1.0x25mm Flange Bolt (RFB-896-RFAB)
• 4x M6x1.0x20mm Flange Bolt (RFB-897-RFAB)

Fitment

• LML: 2011-2016 (VIN Code 8) With HSP Intake

Note: Engine code is dictated by the 8th character of the VIN. The 10th character identifies the model year.

Overview

• Increased performance and spool-up
• Powder coat options to dress up the engine bay
• Upgraded high-strength silicone boots
• Sleek mandrel-bent aluminum tubes replacing factory plastic
• 3.5" to 4" transition for optimal flow

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we believe in our products and back them with our No BS Lifetime Warranty. Weve supported our customers for years — now its official. Below, youll find everything you need to understand the process and guidelines of our hassle-free warranty.

Click here to read the full HSP Warranty