I mainly race the Porsche. With a lowish (7 - 8) downforce I can blow away similarly skilled Ferrari or Beemer drivers in sectors 1 & 2, the GP part isn't actually that bad in the Porsche, I gues cos of its natural grip. But I lose 2seconds in the twisty parts of sector 3. That works for sprint races if you race with fair drivers. I make a second on them in secotrs 1 & 2 and then they catch me and sit on my rear in sector 3 but on the striaght with 8 wing the only car that's been able to pass me was a McLaren, all others stall when they make it out of the draft, or can't exit the last turn in the draft. So on a public server with drivers you know (or on private servers) and you qualied near the front you can defend it on low wing. Also helps that you can jump to the front in the Porsche at the start, especially against Ferraris, you can easily go from 4th to first, they launch so slowly. The other sceario is starting last and rolling up the field, cos you won't get to battle the faster drivers at the front and against the slower ones the top speed give you an edge. In all other situations 9 or 10 wing is the way to go with the Porsche. For quali definitely. And with impatient drivers sat on your rear you're just asking to get punted in race in sector 3. For reference, my PB is 8:14 (splits for a 12) in the Porka, so not quite up to speed yet :D