The 2003-2007 5.9 Stage 1 Cummins Performance Head is engineered for enhanced airflow and performance while maintaining the factory intake plenum for easy installation. Featuring 105-pound valve springs and a 5-axis CNC port job, this head increases intake flow from 155 CFM to 220 CFM, improving low-end power, reducing boost pressure, and lowering EGTs. With hardened valve seats, bronze guides, and a precision CNC valve job, this upgrade optimizes fuel efficiency and horsepower while maintaining OEM fitment. Manufactured by D&J Precision Machine, this head is designed for performance-driven builds and daily-driven reliability.
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