I actually can answer something here which I think most would back up. When I got the engine I had put a P3 in and broke the motor in and I was seeing high temps while doing a race tune. and I switch my plug to a 97T and ran my main and after I pulled it off I was twenty degrees cooler then the P3. So to answer your question and to back up Chris the 97T is the way to go and its cheaper to use and in previous experience has lasted longer then any other plugs I've tried.