Hey I have an r33 series 2. Pretty much stock except for front mount, 3 inch exhaust, Walbro fuel pump, stock turbo high flowed, spitfire coilpacks, haltech interceptor piggy back. running 15psi and 12 psi daily ( 230kw at rears)Had iridium plugs in it that stuffed up followed by Ngk high temp plugs which stuffed up after 5000k's. I have no idea what plugs to put in it, I want good plugs that aren't gunna stuff up, really sick of misfire problems. Any suggestions? I was thinking double platinums but I'm a noob with spark plugs, what does everyone run?