^ needs a whale tail!!
As for me, I'd never go with a crazy widebody kit like that. I would like a subtle lip like many have said above, and maybe replacement side-skirts since the paint on white doesn't seem to match on the stock sides compared to the doors and fenders and it looks terrible.
IMO build the lip first, the money you genrate from that can help you do better R&D on the wide-body and racing inspired bumpers for the people that need the aerodynamics.