Here is my 318ti. Its a 1996 model and its imported from Germany.
The rims were originally for a 330xi E46 and measure 7.5" front and 8.5" rear with 225/45 and 245/40 tires. I am planning on fitting the car with sport Koni's and lower it, but Im not sure how much lowering it needs to look good and still be driveable during the winter

I was thinking somewhere around 1.6" front and 0.8" rear.
Maybe this is a better angle for judging the amount of lowering needed:

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