HSP Diesel 2007.5-2010 LMM Duramax Cold Air Intake - 402-HSP

HSP Cold Air Intake for 2007.5-2010 Chevrolet / GMC Duramax LMM

Part Number: 402-HSP

The 402-HSP is best known as the HSP Cold Air Intake for the 2007.5-2010 LMM Duramax-equipped Chevrolet and GMC trucks. This cold air intake system is a perfect standalone upgrade or an excellent addition to existing modifications.

Why Choose the HSP Cold Air Intake for the LMM Duramax?

The factory intake on the LMM Duramax struggles to meet the airflow demands of the engine. While the LMM is a powerful and capable engine, it needs proper airflow to truly shine. Factory filters are also prone to failure, which can lead to a cascade of issues. Clean, cool, and consistent airflow is one of the most critical factors in maintaining performance and longevity.

What Sets the HSP Cold Air Intake Apart?

The HSP Cold Air Intake features a 4.5" mandrel-bent tube that provides a consistent, free-flowing path for air. This drastically improves performance compared to stock and many aftermarket alternatives. Combined with HSP Diesels signature heatshield box, this system prevents hot engine air from entering the intake stream—ensuring cooler, denser air for better combustion. On average, users report gains of 20 horsepower and 58 lb-ft of torque on the dyno.

Whats Included

• 1x 4.5" Cold Air Intake Tube (HSP-IN-150-2)
• 1x 4.5" Hole Heatshield Box (HSP-IN-748)
• 1x Heatshield Box Lid (HSP-IN-746)
• 1x 4.5" Filter (RFB-413-RFAB)
• 1x 4" T-Bolt Clamp (RFB-424-RFAB)
• 1x 4.5" T-Bolt Clamp (RFB-435-RFAB)
• 1x 4.5" - 4" Straight Boot (RFB-495-RFAB)
• 4x 1/8" Aluminum Rivet (RFB-098-RFAB)
• 3x 10-32 x 3/8" Button Head Screws (RFB-099-RFAB)
• 16x Trim Lock (RFB-411-RFAB)
• 1x Heatshield Box Lid Backer Plate (RFB-746-BP-RFAB)
• 2x M4x.7x10mm Bolt (RFB-901-RFAB)

Fitment

• LMM: 2007.5-2010 (VIN Code 6)

Note: The 8th character of the VIN indicates the engine code, and the 10th character represents the model year.

Overview

• Increased performance and faster spool-up
• 4.5" upgraded mandrel-bent tubing
• Powder coating options for a custom engine bay appearance
• Heat deflection box with an airtight seal
• CNC machined sensor blocks for a perfect fit
• Premium filters for optimal airflow and filtration

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we believe in our products and stand firmly behind every single one that leaves our facility. For years, weve supported our customers with flexible, top-tier service—even without a formal policy. Now, weve made it official. Our No BS Warranty outlines the process and your protections clearly and simply.

Click here to read the full HSP Warranty