1. here you see the problem (BTW this is a pet peeve of mine) with signing up to a forum with a username based on a car (and other types of forums with a name that relates to what you have or are doing at the time).
I would keep the username you have, as that is what we know you as (besides I didn't actually relate it to the car name until this thread

)
2. I don't know about a 745i , however Sama in the UK is putting one into a 850CSI. What year is your 7er?