An LMM EGR delete plate is a simple but effective upgrade for 2007.5–2010 6.6L Duramax LMM engines. It is designed to block or bypass the factory EGR (Exhaust Gas Recirculation) system, helping reduce intake contamination, improve airflow, and support better long-term engine reliability. Many Silverado and Sierra owners choose an EGR delete plate as part of a larger performance...