It's a theoretical program, and it's actually quite accurate. The problem lies in the the information he input. He's obviously overestimating the potential of the modifications he has, therefore he classes them higher up (standard 2.5" exhaust as racing exhaust, etc..). DD2k also makes FLYWHEEL hp figures, not wheel. Upon closer examination of the sheet itself, using the name of the dyno file, I'm going to guess that it's a Trick Flow top end kit simulation. This numbnuts thinks his mods are equal to the TFS kit. OMG.