@bcredliner You do make a good point, it is a bit scary that most of the guys doing the mod don't really understand how either system works. Like I said earlier, in most cases there is a bit a luck/magic involved as well.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)