since there wasn't any helpful reply i found the answer myself via BMW.
I'll post it here for the people that are interested.
Was iinterested in this since i heard on the other bmw-forum that a simple amp could make a big difference in sound for little money. Next thing after that will be the subs...
rgds Robert
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E90 330D M-SPORT MANUAL BLACK LEATHER IPOD-IF BLACKLINES
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