Mishimoto Cold Side Pipe Boot Kit 6.6L L5P 2017-2019

The Mishimoto Cold Side Pipe Boot Kit 6.6L L5P 2017-2019 replaces the factory cold-side intercooler pipe to improve power delivery and turbo efficiency by eliminating the restrictive 2.5in pipe and its tight, flow-restricting bends.

This cold-side intercooler pipe and boot kit is engineered to address the primary airflow bottleneck on 2017–2019 Chevrolet and GMC trucks equipped with the 6.6L Duramax L5P. The stock 2.5in factory pipe and sharp geometry create elevated intake restriction; replacing it with a purpose-designed cold-side route reduces that restriction, which matters for throttle response, consistent boost delivery, and overall engine breathing during sustained loads.

• Direct replacement of the factory 2.5in cold-side pipe — ensures proper mating with existing intercooler and turbo hardware while removing the restrictive diameter that chokes flow.
• Smoother flow path versus factory tight bends — minimizes turbulence and pressure drop across the cold-side plumbing, improving turbo efficiency and responsiveness under boost.
• Kit format (pipe + boots) — provides a complete cold-side solution for a clean installation and reliable sealing where it matters in high-temperature, high-pressure conditions.

The Mishimoto name denotes motorsports-grade attention to fit and function. This kit is intended as a complementary upgrade in systems where improved intake airflow is desired, such as when performing a turbo upgrade or other performance modifications that increase airflow demand. By reducing the cold-side restriction, the kit supports a high-flow approach to turbo system tuning without introducing unknown fitment issues.

Key benefits

• Improved airflow and reduced restriction — supports more consistent boost and improved engine efficiency.
• Enhanced turbo response — smoother cold-side routing reduces lag caused by pressure losses across the stock plumbing.
• Installation-focused kit — includes the components needed to replace the restrictive factory pipe and boots for a clean, durable installation.

Use this Mishimoto cold-side intercooler pipe and boot kit when addressing intake restriction on 2017–2019 6.6L Duramax L5P trucks, particularly in builds that include turbo upgrades or other high-flow modifications. The kit is designed to integrate with existing intercooler and turbo components while prioritizing flow and reliability.