notch for a 4" drop: no
6" drop: like lowc10 said no, but trim or remove the bumpstops
personally i don't like rakes, so i would say go for the 4/6!
no such thing as a 2" flip kit...what a flip kit does is put the axle on TOP of the leafs instead of under it.
i ran 8" drop in the rear with only 1" removed from the frame above the axle and i rarely bottomed.