I am in the process of replacing the throttle housing assembly that attaches to the intake and I want to know what the consensus is on do I get the replacement part from BMW or the OE one from a vendor. VDO makes it for BMW but you can purchase the VDO unit from AutoHaus, ECS, FCP, etc. for about $120 less than the dealer unit. Anyone have any experience with this on which to choose? Thanks in advance for consideration.