Our Altitude Compensating Boost Controller(ACBC) works similar to an Electronic Boost Control (EBC) except it has no electronics, uses no electrical power to run it, cost hundreds of dollars less money and installs in under 5 minutes. It is a simple bolt on device and requires no modifications to the turbo and is completely. The ACBC allows the boost to increase as you increase in elevation, therefore offsetting the horsepower loss due to a loss of absolute atmospheric pressure. This feature allows your power to remain constant. It also minimizes your RPM's fluctuation due to altitude change. Your clutching remains constant regardless of elevation increase or decrease.