The Snow Performance Stage 3 Boost Cooler is a water-methanol injection kit designed to enhance diesel engine performance and efficiency. Built with a 2D mapped controller, it commands injection based on boost pressure and exhaust gas temperatures (EGTs) to maintain significantly colder air inlet temperatures, resulting in a 100-300 degree EGT decrease. This system delivers benefits such as reduced emissions, cleaner engine components, increased fuel economy, and an additional 65+ horsepower to assist with heavy towing and hill climbing. Its construction emphasizes performance, quality, and ease of installation, with a non-invasive design that mounts on the steering column or dash without requiring drilling or interior modification. The kit includes a 7-gallon tank for trip-ready operation and functions as a boost gauge, water-methanol controller, and EGT monitor, all integrated into a single unit. It is designed to preserve vehicle warranty and is CARB EO# D-723 compliant for 50-state legality.

This water injection kit is compatible with all Chevy and GMC Duramax models equipped with LBZ, LLY, LMM, LML, or L5P engines, suitable for heavy towing and daily driving applications. It is a bolt-on upgrade that does not require additional gauges or complex modifications, making it ideal for diesel enthusiasts concerned with engine longevity and performance. The system is recommended for use in demanding towing scenarios where high EGTs pose a risk, providing a reliable solution to improve power, reduce temperatures, and maintain engine health. The kit’s versatile design ensures seamless integration with existing vehicle systems, making it a practical upgrade for Duramax owners seeking enhanced towing capability and engine protection.