what throttle body do you have? if you have a z6 on the bottom is a ftiv. take it apart the inside loosens up causing a surge. ive got a y8 in my hatch and crossover is not noticalbe. i know my solenoid works and i know the ecu is sending a siganl. so imma go w/ all i good. dont expect it to start pulling hard when crossover hits. just a gradual pull