Thanks Don. I'm currently using a DynoSim 4.2 with Pro Tools which I bought a couple of years ago. There is now an upgraded DynoSim 5 with Pro Tools. If I were going to purchase a software dyno today, I would purchase that one and also CamDisk8. If you want to use only CompCams in your builds, they will plug right in once you have the part number you want to try in the motor, but I have found that by not having the cam software, I have to do a lot of shopping for different grinds and then hand-enter them. If you just want to see how quick and how fast a car can go with X horsepower, there are many calculators online to do that. You need only horsepower and car weight. If you want to play with components in the chassis and change setups to see what the result would be, then you would want to purchase either DragSim5 with Pro Tools or DeskTop Drag5.
http://www.proracingsim.com/products.htm