He would have to replace the JDM harness with his stock harness or a USDM B18C1 harness, so the amount of work is about the same. With the stock harness, I've heard people say that some of the wires have to be lengthened. An OBD1 B18C1 harness won't require any lengthening, but will cost a little more since he has to buy it.

If you go back and read the posts, you will see that I already stated this, and he has a CX, so VTEC needs to be wired.