EFI

Absolutely, coil near plug and efi takes so much work out of tuning changes its unreal. There has been many a test and tune where I made passes, reviewed data logs, and made changes, then made more runs without ever taking my belts off.
In general, what kind of changes do you usually make? I’m familiar with the Holley software but not the MS stuff. Do you make changes based on weather or the last time slip.