ST.61 went from 13,800 with MA 11X7 to 16,000 with a mac's tune pipe system--wow! Only problem is keeping glow plugs from cooking. I am thinking maybe a larger prop--11X8 or 11X9 to keep rpm down. I tried running a little richer, but couldn't get it "on the pipe." I am using a Fox long reach with idle bar plug. Tried K&B 1L but couldn't keep it running. Any prop/plug combination suggestions would be appreciated (or any other suggestions for that matter as I am newbie to pipes).

Thanks.