Just installed mine 2 weeks ago, take your time marking where it goes on the trunk, I fit mine with the backing still on the dbl sided tape. put blue painters tape on the trunk around the edges where it should sit. took the backing tape off the spoiler and just landed right back between all the painters tape. If your using the red backed 3M tape removal once its stuck gets tricky.
09' AW M3, 6MT, Black Novillo Extended, Carbon leather trim, Premium, Moonroof, OEM Carbon spoiler, BMW LED Int. Bulbs, Avant Garde 19x11/19x9.5 M310 wheels, OOLux V3 AEOO, Vorsteiner Type II diffuser, Megan Racing Stainless exhaust, Benvo Stage 1 tune, Dinan High Flow Carbon Fiber Intake, Dinan Front anti-sway bar, H&R Sport springs, 30% tint