I've heard that the desktop dyno programs can be very accurate if you know your head flow numbers. However the other wildcard seems to be choosing the correct intake manifold and trying to determine which of the flow categories it really belongs. I never know which to enter for the Air Gap - but have assumed dual plane high flow.
i got the full version from another site now cuz i couldnt figure out the one here, and i got the drag race simulator with it as well....let me know if anyone wants it
here is the link...its in the middle of the thread...if you already have the crack done on desktop dyno then you get the full version of the drag simulator when you download it (thats what it says anyways)...either way just follow the install notes- it took me a while to get it but i ended up nailin it (not computer savy even though my generation lives at the computer)