If you decide to go OBD1 you will have to get a OBD2 > OBD1 harness which will run from $50-$100 on ebay. Getting a OBD1 ECU will increase rev limiter(there are several on ebay that increase rev limiter anywhere from 8200-9200)change fuel/air ratios, and will remove speed limiter(this one I need...my '98 LS topped out at 115)