I have just recently purchased my first Bimmer (1985 318i) for $500 and I am loving it. Their is however one thing I still do not understand and that is the letters after the model number. I get the numbers (318=3-series 1.8l) but what do the letters mean such has the 318i, 325e, 325i, etc, etc, etc. Thank you and I hope to visit often.