Vari-Cool II is latest design in progressive methanol water injection technology. The Vari-Cool II is designed to be super high performance, simple, convenient and lets face it...cool as hell. This controller will inject using an accurate algortithm based on your min/max settings. In addition to that it can display your flow rate (with optional flow sensor), Display your dutycycle, boost or voltage and much more! To learn more about this controller please read our detailed write up here: