insane air flow needed +
The amount of grill/vents needed are insane. I created a 1,200 HP engine and the whole front of the car and hood had to be vents and grills. I couldn't even put headlights on it.
Mid engine? Forget about it, you'll never fit a large V8 in it. I have squeezed in a 580 HP engine so far.
On a different note, if I minimize the game (alt-tab) it will not come back on screen right. I am running Win7 64
Overall, great game. Looking forward to the business aspects being added.