I have a 95 LX A4, and i have a z6 head, intake manifold, tb, etc..from a 95 ex. Do i still have to buy a p28 ecu? I think my car is obd1 and so is the ex, so i wouldn't need a obd converter right? I've read the mini-me tutorials, and they say nothing about running an oil supply line to the new z6 head, my mechanic swears i will have to plumb a line to the head. If i do need to swap in a p28, can i just install a vtec controller instead of the p28?