Why would you go obd2? Convert it 2 obd1 if u want...and a crx si should have vtec wires in the harness (correct me if I'm wrong) if not wiring vtec to your ecu is fairly easy....what ecu are u running? ....80k is nuthing you can boost your car specially if its healthy as u say..as far as upgrades for your motor (aftermarket manifold,headers,bigger cam,high compression pistons,etc etc....pm me for any questions....