Replacing exhaust from 2000 to a 1999 VFR

I have a 2000 VFR with cat and have access to a 1998/99 header. If I do the swap to rid myself of the cat, will doing the resistor trick and tying up the O2 sensers somewhere be enough. Or will I have to get a Power Commander and use 1998/99 maps?

Oh, I will be using a aftermarket Two Bros Exhaust with the system...

Any suggestions or experiences would be helpful.

Thanks.