the way i was told to properly use a grounding kit is to return all peices of metal that has a sensor attached to it that has a gasket seperateing it from another peice of metal with a sensor back to the battery... i have grounded the TB once, the intake once and then led one from there to the firewall, one from the thermostat housing, two from the head, one from the bolt that bolts the ECU to the bracket, that way the bolt is going directly into the ECU, and then the one from the battery to the strut tower, i also upgraded the crappy battery terminals and the power and ground wire to stinger pro series 4gauge stereo power wire, i noticed a difference in the way the car idled, the HIDs seemed to be a bit more crisp, but i did notice that the guage lights seemed brighter, it might have been my imagineation but i thought i noticed a difference on the top end pull, could be wrong though.