Hi,

Having not been able to find any NGK9's I have opted for the Denso IK01-27 iridium racing plug which is supposed to be exactly the same as an NGK9. The question is what will the gap be ? I have been using champion C57's with a gap of 0.7mm but will the gap be the same for the iridium plugs ? I am running 22psi with a stage 3 head & stage 3 turbo. Car is a series 2 erst.

Also, this plug is resistorised where as the normal NGK9 apparently isn't, what does this mean

Cheers, Duncan