Alright well if anyone knows for sure, please post up. I know for a fact that these cars run with the ecu lying on the carpet. I also know that the ptu is supposed to ground through its metal bracket but I have seen a car running fine with it just dangling there with no bracket at all. Just want to make sure it is right, I know there are grounding wires at their connectors, just wondering if they were designed to be grounded through the casings as well. I thought of the 99 ecus case being plastic, but after looking at some pics of them, they have metal brackets to mount them.