if your not running alot of Alcohol you don't need another tune. Just need to tweak your injection system for the water/alcohol.. Example ,, what boost level to come on and what boost level to turn off.. If you have the controller you can start with a low volume.. I've used coolingmist for over 2 years now and have had no problem with it on the lower volume settings along with using a 30/70 alcohol/water mix/.