I'm 2.5" drop all around on Racing Hart M6 (1pc) with 215x35x18 and not rubbing. Next is 215x40x18 though since the other one is kinda low profile.
I'm running Wingswest W-Type front lip and side skirt (lost the rear due to a rear ended 5 months ago). Mugen Rear apron. And also Mugen front lip as well whenever I like since I have two front bumpers, each with its own lip kit.
I like the way it is righ tnow