HPS polish intercooler charge pipe cold side (Part# 17-120P) is a simple yet effective performance upgrade for 2017-2020 GMC Sierra 3500HD Duramax 6.6L V8 Diesel Turbo L5P oem restrictive plastic intercooler piping. Enjoy quicker acceleration, improved fuel mileage, easier towing, and increased long-term reliability. Designed completely in Solidworks, this piece was made with ease of installation in mind. Utilizes the factory intercooler quick connect. Two-piece design allows for easier installation while offering flexibility from engine movement. Installation of a tuner is not required. Increase air volume and improve airflow. 3-1/2" Mandrel bent 6061 aluminum tubing with CNC machined billet flange and weld-on bung to connect?the existing auxiliary sensor. The kit also includes HPS signature high temperature 4-ply reinforced silicone coupler and heavy duty 100% stainless steel T-bolt clamps. Easy to follow step-by-step installation manual with clear pictures and instructions to guide the installer throughout the whole process. NOT CARB Complaint. Compatible with?factory intercooler. The product fits 2017-2020 GMC Sierra 3500HD Duramax 6.6L V8 Diesel Turbo L5P.