I found a while back that the 325i head and computer could be put onto the 325e to increase the power of the engine. I haven't been able to find much in the way information though. Does anyone have any information/ links concerning price/procedure/amount of power added. Is it a worthwhile thing to do and how difficult is it?
Search on r3vlimited.com They have plenty of threads on S/M50-52 swaps and 2.7i conversions. I would consider it a worthwhile thing to do because if you have an eta, you know how dog slow it is. This should yield more power than a 325i.
Don't go to r3v expecting someone to answer that question for you, though. Do a forum search and read the threads detailing the conversion.