Originally Posted by cssaddictm4

What is most interesting in my research is the fact there are many plugs for the EVO8 but hardly any for the EVO9. I know it has been discussed that the EVO8 plugs will fit the EVO9 but I am not comfortable with that solution. One main thing is the reach of the spark plug for the EVO9 is considerably longer (it is called long reach). I tried using the EVO8 plugs myself and the spark plug boots did not fit/go all the way down. I am interested in trying 8&9 temps. I plan on calling NGK and Denso first thing tomorrow.

Originally Posted by Warrtalon

I would suggest staying in the same heat range (7) with those mods. Go get some Copper NGK BPR7ES or Iridium NGK BPR7EIX. If you were running alky and 23-24psi daily, then I'd suggest you get some 8s (BPR8ES/BPR8EIX), but I don't think you need those right now and will run better on the 7s.