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I have FAST efi on my cobra replica. Its the EZ system that self tunes and learns. It does not like work well with any cam that will have alot of valve overlap and a 8 stack IR intake. I have a very lumpy cam that is on the border of valve overlap for the system but should still work fine. It doesnt. Runs richer then it should. No way to modulate anything. The low vacuum signal doesnt allow the MAP sensor to tune mid or rolling throttle very well. idle and WOT it runs great. I learned that the hard way. If you get a system upgrade to the XFI system from Fast. It wil allow you to take it to a tuner or tune it yourself. The EZ system does not allow you to do this. The extra few bucks spent will def pay off in the long run when you change parts or want to build that engine either milder or even a wild.
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