i have a plain black plug in mine and its not bad at all. i'd like to get my hands on the OEM cover and cut just a little hole through it though to make it look less conspicuous.

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01 X5 3.0i (gone)
04 X5 4.8is (gone)
06 X5 4.4i (gone)
09 X5 35d (current)
12 X5 35d (current)