I am about to do this conversion in a 1998 EK9 Hatch with an Automatic Tranny in it.

B18b1 with an Automatic Tranmission and ECU for it. I would be putting this into a 98 EK9 Hatch. I know for this to work I have to get the b18 with OBD2. What else would I need to know ahead for this ordeal.