Was curious.... do you have a favourite car with which to test your track? Do you design your track with a specific series in mind? A specific type of car? Speed? Age? Obviously it depends on the track type to some extent, so I was wondering more about asphalt tracks. I find different cars are easier or harder to drive - and I suspect it's down to the modelling of the car - and consequently find it hard to properly judge the difficulty of my track if I think the car modelling may be suspect. It affects how I build my track! I like driving the Zonda, but feel the IE Ferrari 430 is more difficult and 'realistic' to drive. The BMW M3 CSL is also one I use a fair amount.