Yeah its really easy to do, I just recently chipped my p06, added vtec and IAB’s.
If you have a P06 you probably have the 1720 board, here are 2 links with instructions on how to convert to vtec.
http://web.archive.org/web/20060103100457/www.pgmfi.org/twiki/bin/view/Library/02D01720-1500