My friend is installing his Zex Nitrous kit on his Cobalt. I haven't looked at the car yet to find the fuel regulator, but I would imagine it's on the rail like most of the GM cars. Would this be a fair assumption? Also we need a wiring diagram for the TPS to hook up the Nitrous management unit. I have a meter and could ohm it out if need be, but if anyone has already done this install then your help would be greatly appreciated. Thanks.