Overall, the cars are good but like others I have some problems with the physics. I'll try to swap tyres like someone said.
But the most annoying problem for me is the sound. The onboard engine sound is VERY good, but the kinda "pop" sound with the tunnel reverb effect every time I release the gas pedal is SO annoying after 3 turns... Tyres screeches too, why this reverb ? Is there a way to remove these ?