The Problem with the Factory Cold Side Pipe - The OEM cold side intercooler pipe on the 2020-2024 L5P Duramax is functional, but far from optimal. Constructed from rubber, the stock tube is vulnerable to heat, pressure, and age-related degradation. This often leads to splits or leaks, reducing performance and risking turbocharger damage.

The HSP Solution - HSP Diesel has engineered a premium alternative designed for both long-term durability and high-performance functionality.
Key Features:

• 2020-2024 Chevrolet/GMC 2500HD/3500HD L5P Cold Side Tube Deluxe Flag Red
• 3.5 inch Mandrel-Bent Aluminized Steel Pipe: Offers smooth, unrestricted airflow for better throttle response, improved reliability, and a cleaner engine sound.
• Billet Coupler Set: Includes a CNC-machined billet aluminum intercooler coupler and a billet throttle body coupler for the strongest, most secure connections available - eliminating weak points common in OEM designs.
• Reinforced Silicone Boots and Stainless Steel T-Bolt Clamps: Leak-free performance under high boost thanks to high-strength boots and T-bolt clamps.
• Custom Powder Coat Options: Multiple finishes are available to suit your truck's aesthetic and complete the under-hood look.

What's Included:

• 1x Coldside (HSP-IN-870)
• 1x Welded Throttle Body Coupler (HSP-IN-873)
• 1x 20-24 L5P Throttle Body Coupler (RFB-873-RFAB)
• 1x 3.5 inch Aluminum 60 degree Bend (RFB-310-RFAB)
• 1x 20-24 L5P Intercooler Coupler (RFB-872-RFAB)
• 4x 3.5 inch T-Bolt Clamp (RFB-423-RFAB)
• 1x 3.5 inch x 4 inch Straight Boot (RFB-871-RFAB)
• 1x 3.5 inch x 3.5 inch 18 Degree Angled Boot (RFB-875-RFAB)

Vehicle Fitment:

• 2020-2024 Chevrolet Silverado 2500HD / 3500HD w/ L5P Duramax
• 2020-2024 GMC Sierra 2500HD / 3500HD w/ L5P Duramax

OEM Replacement For:

• GM Part Number 84682179

HSP No BS Limited Lifetime Warranty:

• At HSP, we believe in our products and stand firmly behind every component that leaves our facility. For years, we've supported customers by going above and beyond - even before we had a formal policy. Our No BS Limited Lifetime Warranty now puts that same support in writing, outlining the process and guidelines to ensure peace of mind with every purchase.