the FO8 is the best looking open wheel in LFS. It's clean shape makes it look better than the other. A bit like mid 1990's F1 cars.
The GP2 are ugly. They are made too look like the modern F1 cars which look even uglier. The modern F1 cars are crippled with stupid and ugly aero accessories. They looks stupid because the modern F1 regulation are much too restrictive and doesn't permit the engineer to make better design. So they need those external devices to correct the flaws.
The FO8 should stay as it is. If you want a GP2, ask for a new ugly car. No need to spoil the FO8.
We have a good range of openwheels. I'd only add a champcar like car, a bit heavier and longer than a Formula 1 but with a more powerful turbo (yet less efficient in the low revs) engine and steel brakes. F1 cars are fast but not much fun to race because passing is always difficult with those brakes.
I'd better see a whole endurance prototype package, starting from a tiny barquette such as the
Norma M20 or
Osella with a motorbike or >2L engine. Then a LMP2 like car and 2 LMP1-like cars, one open, one closed (we don't need diesel engine though !) with slightly different physics. I'd see the closed one more aero efficient and faster in the long straight while the open one would be slightly lighter.