| Welcome...I love the bimmer...(Just sold my E46 M3)
Yes the H7 Xenon conversion kits will work. Ebay is a good place for a deal.
As far as springs go...if your in Chicago I know the roads suck (Im from Detroit). I wouldn't lower it as the ride will be even rougher. Premium or Mid grade should be fine and as asianml said, 0-40 Mobile 1.
The Z2 should work without any issues if your pre 2002. The bose amp uses standard wiring as opposed to newer ML's when they use fiber optics. |