Just wondering if it is really worth the cost of the AFC for a car that probably wont exceed Stage 5 mods within the next few years. I am running the Z1 chip, and i do have free access to a dyno so tuning (wideband 02 as well) would be available to me at any time. The other question is how much can I really improve on the Z1 A/F, etc by tuning with the AFC, as opposed to just using the Z1 eprom.