Hey Tinstaafl
According to the info I have all the installed options adds 180lbs to the standard empty weight...that gives her a Basic Empty Weight of 3550.5lbs. This translates into a useful load of 1199lbs.
The C of G moves forward by roughly about an inch.
All in all it doesn't make a huge diiffernce.
I don't have the exact figures of just the EFIS in particular. We've had another few options installed.. like for instance a slightly larger oxygen bottle... wx radar... Skywatch... co-pilot instruments and electric trim. And one or two other things I can't put my finger on right now!
Dean