Steve, what did Paul and the others think. I kno you have worked a long time on this, and I don't want to rain on your parade but something isn't adding up. There is no reason you shouldn't have made at or much nearer to 500rwhp with your mods. The top of that graph looks weird to me for a
vortech car, the HP sort of flat lines from 5250-6000 like and NA car might, but a vortech car shouldn't, at least not at that low of an RPM even with the added cubes IMO. Is the stock vortech inlet "soft" or is it a hard plastic? If it was soft maybe it was semi-collapsing on itself and starving the supercharger for air. It looks like you hit a wall at around 5250 and normally its due to something being at its limit for flow, but in your setup there shouldn't be anything that isdoing this, at least not that I can think of. I'm stumped...