Hello to allâ€¦ I bought my CRX DX in February of last year, it had the D15B2 motor with DPFI . I still love this carâ€¦. The gas mileage is great and itâ€™s all-round a blast to drive, (now that Iâ€™ve rebuilt the entire drive train / suspension in the front end.) Since I got the car Iâ€™ve read five different articles on swapping from DPFI to MPFI. Iâ€™m going to take the plunge and do it. Most of the articles focus on using parts from the CRX Si motor, D16A6, swapping in the D16A6 cam shaft as well, wrapping everything up with a PM6 ECU. Iâ€™m fine with all of that, and I understand how to do the swap. My question is; Canâ€™t one simply use the entire top end from a D15B7 instead of the Si? Before you answerâ€¦ The catch being that you must also commit to a OBD1 upgrade (P06 ECU)? Am I correct in understanding this to be the case???? My reason for considering going this route is that Si models are hard to come by in the local Pick-a-Part yards near me. So, the only other thing I must make a decision onâ€¦ The Head that is currently in my 1989 CRX DX is stamped PM#-13, 91â€¦ I believe that the head has been changed, doesnâ€™t the 91 denote the year of manufacture? Should I swap the whole head from the D15B7 over to my D15B2, or just swap over the cam? Itâ€™s my understanding that the head castings are identical. Iâ€™m just looking for suggestions on this one. Thanks for all of the helpâ€¦ HondaSwap.Com has proven invaluable to me in doing my research on my CRX and itâ€™s motor!!! Keep up the good work, also I plan on posting pics of my teardown / build. I hope that this will help others!