OFAB and OFAC are the types of management. You can not run an OFAB chip on OFAC and vis versa. You can tell by the map sensors, ofab or ofac, are bolted to a plate on the back of the bulk head, behind and just to the left of the brake servo when looking face on into the engine bay. Search on google images to find out which one you have. If its OFAB i have a 195 chip