BD, very strong rumors are that the Aeroikt will never be sold in the US... j/k! dont kill me!
Fanch, I think the aerokit is designed for more downforce, no? So adding only the front would add more downforce to the steering wheels at high speeds? I think it is less worse than adding only the rear
BTW; if only adding the front, the car looks unbalanced aesthetically... to much attention is drawn to the front... not something I would recommend.
-Joost-