Instead of having the EWS removed via tune or using the 328i key, I would sync the EWS with the ti.
This can be done with a $10-$20 ebay usb to obd2 cable and gpeterson's software located here:
http://www.bimmerforums.com/forum/sh...&highlight=ews I have used this on several dmes with no issues. Best of luck with the swap.