I have a DIY stage 3 saph cos - done by previous owner.....

its currently set to 15psi boost, peaks at 17psi - once i have done a few bits, i plan to get it setup to run about 20-22psi if possible

what spark plugs do i need?

been told several different types by various tuners, seems like I could bung any plug in according to the differences in opinions i got!

Cant remember any of the dam part numbers i was told tho so any help and prices much appreciated