My e46 and and auto xi sound the same. My 5mt x5 is louder and think something is amiss, but have not got around to addressing it yet. It drives fine but it bugs me it is not a smooth sounding as the other two.

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2001 E53 X5 3.0 Auto. Silver Black Build date 10-17-2000 141kmiles

2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles