This fin appears to have some kind of coating on it. Anyone know what this might be? Also, the shaft has noticeable slop in it just from moving it with my finger. Is the turbo shot? I was hoping to get by yet this year without a turbo mod as I have other things to do with my GN budget money. If its time for a rebuild what could I expect that to cost vs. a turbo upgrade. My long term (stress long) goal is to have a high 10/low 11 second capable car. It won't be driven at the track.