I searched for a little while but didnt see anything that really caught my eye. Im starting to learn about ECU tunning and such. I have a all motor Gs-R with a Si-R head and was wondering if hondata and a Apex-I vafc-II would be a good tunning setup , or if i even need the Vafc. Whats the best all motor Hondata tunning program. And if u could explain a little bit to me as far as what is s100 and s200 and all that. so bascially need to know yes or no on the apexi with hondata? Which one to get? And a breif explanation of what the diff models are and there tuning capabilities.