Not sure how accurate it might be when you start getting up there in the hp range though. I played with it a bit and it said that at 7 psi my 535 CI big block Ford motor will be making 1000 hp. Not sure how accurate that might be. Similar with the 03 Cobra motor we ran the numbers on. I would call that particular program more of an "Ideal" calculation, not necessarily what might be seen in the real world. Take for instance the difference in the Subaru exhaust system vs an Evo. There is an obvious difference in spool, exhaust runner length, heat loss, etc. But matchbot does not take this sort of thing into account. It goes by an ideal situation. Either way, great program for getting you into the ball park.