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If I had to guess...there is a fan in the trunk behind the liner on the drivers side. This cools the amps for the stereo and it is pretty loud when it's running.
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Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater
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