you can use a xr2i loom, just need to reconfigure the pins on the ecu plug and disconnect pin 2 on the edis module (for OFAC anyway, you should check for OFAB), I just converted my friends RS 1800 over to cvh turbo running OFAC, I used a xr2i bay loom, modified the bay loom plug to match the RS 1800 loom and works very well. just remember that any loom can be converted to work with anything, its only single wires going to and from the right pin on the ecu to the signal pin of the sensors.

Hope that helps a bit