with a regular xcal you only get 3 tunes i hear, no adjustability. you need the extreme racer package to adjust it yourself. it seems like alot of money and some guy you dont know tunes a car he's never seen before, unless you pay for hours of dyno time. it seems expensive. i'm going to see about getting a PRP so i can do everything myself, just like the schmuck tunes yours on the dyno. SAFC is maf trickery, but it works well enough for bolt on's and such. my friends with imports have had good results until you start getting into dry nitrous, or boost. then you need the good stuff.
