OK, I heard it on the way home last night - noticed it with the sound turned up and under heavy exceleration, so it most definitely is engine noise.

Tom - any ideas on how to reduce this??

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!