i''m rebuilding my top end of my sierra cosworth 4x4 (green rocker cover) but when its ready i wnat to tune it to stage 1 but theire so many chips available wich one is the best for stage one en how much psi is the best i can run safe? and do id ned a rolling road set up with live mapping for stage 1 ,i''ve already got a air fuel ratio meter in my car to see if the fuelling is right
thanx