OBD2? A million dollars. Why? The chips that were used for the Preludes are not reprogramable and there is no source for new ones except possibly hunting down Honda Japan to give you blanks if they haven't coded them already. Here is where the million dollar bribe comes in...
For OBD2, you need to convert to OBDI and get a reprogram or Hondata, Zdyne, etc.
You cant reprogram a OBD2 Prelude ECU because of the immobilizer, but I beleive you can just use an OBD2 GSR ECU. Since you are reprogramming it, you can redo the fuel and timing curves to suite the H22.
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