Motorman, I am new to this site and have learned a lot from this thread but I do have one question. I have an RB X12 5 port turbo in my Serpent Impulse Pro and I want to change from 20% to 30% nitro. It has the stock shim (approx. .015", I don't have a digital micrometer) and I read elswhere that you are supposed to add a .01mm (?) shim if you want to run 30%. Based upon the info here that would seem incorrect. Do you agree? I would really like to know what you think. I live in So. Fla (hot, humid and +10' above sea level). I would also like a glow plug recommendation please. I have an MT-12 I am putting in my truck and the info you gave on that was perfect.

Thanks,
jag