I use BP8EVX- I melted a set of W4DPO, mind you I've also melted one Bosch one, but I think it was a bad plug.
ereeiz- are you talking about recessed plugs? Common amongst boys running huge bhp nitrous setups- some do start engines on normal plugs, get it warm, then swap. Apparently they're a bugger to start when cold, I've never used them myself though.