You ought to also consider TCKline suspension / coilovers, depending on your economics and performance goals.
TCK is based on Koni sport dampers with shortened bodies and valves matched to the springs.
TCK will be overkill if the goal is simply to slam. It's also one of the few / only options for the xDrive platform. On the other hand, TCK works well on the track without killing street comfort, unlike KW. I had the TCK SA coilovers on the last car. They just work.
TC Kline Suspension
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2011 6MT RWD ClubSport Wagon | 3,185lbs | 1 of 149 ZSPs delivered in North America
Outside: BMW M-Aero, Euro region lighting, Seibon | Inside: M3 cockpit, Recaro SPG, Prototipo, AutoSolutions SSK, UCP | Stop: M3 ST-40R, PFC | Grip: Solid-mounted subframes, rear coilover conversion, M3 Nitron R3, Hyperco, SPL, AKG, ARC8 | Go: StageFP, CF snorkel, 3IM, MILVs, SuperSprint headers, Dundon Motorsports Inconel exhaust, VoltPhreaks | Cool: CSF | PCA #2018100384 | BMW CCA #505794