My car is going to be about a 90% street and 10% track car. I was looking at the ME website and was debating on the 8 0r 16. I don't really know what the last 8 positions do on the 16 ME but if they come in handy in the future I will save up a little more and get it but does anyone who has the 16 use all the positions to tune? Just seeing if I really need to cough up the extra $100 and learn to use all the functions. Thanks