it goes inline with the TPS, how does it work...when i had it installed just now, i couldnt get the idle right, it would hang at 2000rpm while driving or coasting to a stop...
It is a TPS throttle enhancer. It is supposed to increase your voltage going to your TPS sooner. Giving your TPS WOT voltage at about 50 to 80 %. I wouldn't use one.