Read my sig for my mods.

Basically I'll be putting down 500hp and I don't want to throw away plugs every oil change. I am thinking of HKS (which are re-badged denso's i'm told) or NGK Race Plugs.

I am not too sure what heat range to use, as I don't know much about the spark plug temp ratings, etc etc etc...

Ive seen posts on recommending Denso Irridiums (running about $30 a piece).

I've seen posts on HKS Racing Plugs with a 10.5 range.

I hear people use 9's for leading and trailing in most fd's... but I am not sure which way to go.

I am spraying methanol at 12+ psi.

Someone with some experience please help out =) I am looking for spark plugs that will last a good while (10-15k miles +) with my mods.

Thanks
-Darren-