I have 18's with a 20mm drop (M Perf Suspension).
I'm at the burgermotorsport page and they recommend:
12mm up front
15mm out rear.
Has anyone tried this, seems pretty aggressive...will be running these with 18" 400's.
2012 335i Mineral Gray
M Performance Exhaust/Brakes/Suspension/LSD|Bav Stage 1/AMP||ER CP/IC/DP/OC | Dinan CAI/N55 PWG BIG TURBO|BMWF30.com