Hi I have a 1992 Prelude 2.0i (F20A4) with P11 OBD1 ECU. And I have orderd a 97 H22A Type S engine. Wich uses a P5 P OBD2 ECU. If I understand this right, I will need a OBD 2 -> OBD1 conversion harness and a P13 OBD1 ECU from 92-95 H22A? I have been talking with a tuner to night, he told that if i use a Hondata S300 i wouldent need a conversion harness or a P13 ecu. but to use a S300, and that I would need a P28 or P30 ECU, is this right? I`m planing a turbo in the near future, within a year or so. So Hondata should be the way to go? Have i got it right now? please correct me if i`m wrong.. edit: maybe i misplaced this..