For German pages, check Google or something. I dunno what kind of stuff there is, but I'm sure Google will pick up some German pages. Go pick up a BMW magazine. My buddy said the supercharger stuff he had seen was in one of the BMW magazines. He said they claimed it was real easy to install the SC on the 330, I'm sure the 325 isn't too far off in the ease department. I can ask him which magazine, I don't know why I didn't do that in the first place.
I wouldn't exactly recommend getting a Greddy exhaust for the 325, I'd recommend going with a German exhaust. I haven't heard a lot of decent sounding Japanese exhausts, really...whereas the Germans make some nice sounding exhausts with decent performance gains.
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