In recent years, much attention has been focused on alternative fuels. Of those available, E85 is the commercially-viable forerunner that, with minor alterations, can be distributed using a vehicle's existing infrastructure. Specifically developed/calibrated for use with E85, these carbs have been dyno tested to produce optimum power and tested on numerous vehicles to validate calibration. Applications vary so some calibration changes may be required to maximize performance potential on your vehicle. Current calibration is an excellent baseline that is closer than methanol or gasoline carburetors.