Features: Adds an additional 20psi boost from 20 psi stock up to 40 psi total. Adds up to an additional 65hp. Reduces exhaust gas temperatures even in stock applications, excellent for high elevation towing. Set the additional boost to fit your needs, even while driving, just turn the dial to match your current driving conditions. Race mode control option allows for faster acceleration from standing starts or low speeds. Plug-n-Play module with two simple connections under the hood. Product Discription: Interested in increasing your boost pressure in your Duramax LLY? New LLY adjustable electronic boost controller. Plug and play in cab adjustable on the fly. Dial in an additional 20psi boost from 20 psi stock up to 40 psi total. Cleans up additional un burned fuel (black smoke) in hot programs while adding up to an additional 65hp. Reduces exhaust gas temperatures even in stock applications, excellent for high elevation towing. Set the additional boost to fit your needs, even while driving, just turn the dial to match your current driving conditions. Race mode control option allows for faster acceleration from standing starts or low speeds.