Mishimoto Cold Side Pipe Boot Kit Polished 17-19 L5P

The Mishimoto Cold Side Pipe Boot Kit Polished 17-19 L5P improves airflow control for the 2017–2019 Chevrolet/GMC 6.6L Duramax L5P, addressing intake restriction to help restore power and improve engine efficiency.

Factory cold-side plumbing on the L5P uses a 2.5in pipe that chokes the engine and includes tight bends that create additional restriction. The Mishimoto cold-side intercooler pipe and boot kit replaces this restrictive section to reduce flow losses and support a more efficient turbo system response.

• Cold-side intercooler pipe and boot kit — Replaces the factory cold-side component to eliminate the primary choke point; this matters because reducing restriction on the cold side directly impacts turbo efficiency and overall engine breathing.
• Polished finish — Supplied in a polished configuration to provide a clean, durable appearance that integrates with visible engine-bay upgrades.
• Application-specific for 17–19 L5P — Designed for the 2017–2019 Chevrolet/GMC 6.6L Duramax L5P to ensure correct packaging and connection to the factory intercooler and turbo plumbing.

This kit is targeted at owners performing a turbo upgrade or other performance exhaust and intake modifications who require a less restrictive cold-side path. By addressing the factory 2.5in choke and the tight bends that create restriction, the Mishimoto solution supports smoother flow through the intercooler circuit and more consistent turbocharger performance.

Benefits at a glance

• Reduces intake restriction caused by the factory cold-side pipe and tight bends
• Supports improved turbo efficiency and more responsive power delivery
• Polished finish for a refined engine-bay presentation
• Direct-fit design for 2017–2019 Duramax L5P installations