If your building your own tunes not just using someone else's tables and tweaking little shit and calling it "yours" i would really really really really do my reasearch and learn from somebody who has experience in tuning, your engine just ins't something i would fuck around and "learn" on lots and lots of man hours go into these gas tuners learning how to tweak every table etc. Diesels are a bit easier but i would really do your research and try to get classes, hands on help, watching and taking advice from current tuners and always take everything with a grain of a salt. Like said before a good wideband 02 guage and lots of data logging will help also