ok prelude lovers....i found two rare PK3 obd1 ecus...im keeping one for my lude...this ecu is for the also rare B21A1 found in the 88-91 2.0SI and SI preludes...the only way to find one is to own one...only the SI B21A1 has this ecu...i also have access to two whole si preludes 1990-1991...they still hace there obd1 harness and seats... rear tail lights...clusters...etc...one is the most rare 1991 SI B21A1 with 4WS and ABS yes ABS and 4WS...let me know ill pull parts for you...more power and easier to tune...shared_pm me