I do have to admit that I have no recent experience with a 9 sec. GN running mid 9's with a chip?
Also do not know if proven chips are available for 9 sec. builds?
I do know however, that there are MANY XFI programs for different builds that would be an excellent starting point for a mid 9 sec. build in a GN.
The new XFI upgrade has a self-learning capability that will make it easier and safer for a novice to get started and up to speed rather quick. Nothing like that is currently possible with a chip.
Not to fault Eric but it is typical of chips to be re-burned, as I have had many customers request their chip to be "tweaked" to optimize performance, and have had extender chips sent back for the same reason.
I personally know it is NOT easy to tune, or even build, into the 9's, but using current 21st. Century technology is certainly easier, more reliable, and more precise than 30 year old computers and technology using piggy-back modifications.
As far as changing programs, XFI has an optional thumbwheel switch that will allow switching between 4 different programs. :smile: