[mowflow]

+1. Splitters and spoilers aren't going to help much at those speeds. It's the reason why most cars with active spoilers don't have them active until around 70mph.

I think you need to be looking at grip and suspension. If you have the MPSS's on then you probably won't get much better for road use so you would be looking at wider section I would say. The trade off is increased unsprung weight.

If you are fitting a rear wing then the AC Schitzer one may be a better option. Due to it;s design i could see it at least standing a chance of creating a minuscule amount of extra downforce..... if you were going really, really fast. To be honest the F20 aerodynamics are pretty shit so it's not like anything will make it worse.