i ran the original P3 plug (very hot) in my vspec for about 1.5 gallons before MY mistake killed it. it may have even lasted longer but now ill never know. the vspec made its best power with that plug and had an awsome bottom end. ive tried everything in it from a novarossi p5, p6, p7, and medium dynamite plugs, the extra hot P3 from os ran the best. if you want to run a hotter plug, just make sure your head is shimmed accordingly.