I was tuned on Neptune which i like a lot but since have went back to a crome tune for the event approaching b/c of lack of tuning $ for a Richmond trip.. ran 110 mixed w/ 93 and tuned on ngk bkre? heat range 6 i know for fact...I've been to 8s which are 2 steps colder but faul them out with in a 17 psi pull..bought some 7 ngk heat range..fouled them as well...I seem to have better luck w/ the 6s which is a stock Honda plug from advance ..tuned to go to 25 psi on mixed fuel but hadn't been able to get past 18-20 since being home from the dyno...it sux..but i have had the best luck w/ the 6 heat range...matt tuned me on 8s which worked well but that was only a street tune on 10 psi..idno i'm going broke buying plugs..oh I have crane ignition w/ msd coil and cap..i have replaced the button already ..my friend tells me i need to replace the cap b/c he had a similar issue....