On track programs is the a/f ratio usually leaner then on street programs? If so, how much leaner? 12.5ish????

 

You are correct that track/race programs are usually a little leaner than a street program. The tuner might also add a little timing as well. For me 12.5 is too lean for any program. I wouls not be comfortable beyond 11.9-12.0 area. .5 is a big change. Keep it safe and it will last you a long time. Keep it lean and it will be fast for a short time.