Looks like about 135-155bs extra compared to similarly equipped F82 M4 (3525 for M/T with half a tank of fuel)
https://f80.bimmerpost.com/forums/sh....php?t=1023335
Carbon bucket seats (9.6kg weight savings) negate the extra weight of bigger wheels
Question to OP: what GVWR numbers does it say on the door card? Picture of it would be cool.