Looking for a step up from the KW V1's, but don't want to bump up your budget too much? Then the V2's would be the best choice! The V2's include a dampening adjustability. This would be great for switching from street use to track use. The V2's are popular for their overall use for street/track since the V1's are only height adjustable.
The V2's feature a full stainless steel construction. This helps make the coilovers last a lot longer compared to other competitors out there. Unlike the the V1's, the V2's feature a rebound adjustment. Also, not to the mention that it's made by KW!
All 2006-2011 BMW E9X 3-Series 2WD (does not include XI models)