yep, that's a pretty good estimate. i was just thinking about a friends 5 liter saleen mustang that had a vortech. he eventually ran 14psi boost- but for him every 1psi was worth 21hp- 600hp at the crank. that was a fun car to ride in. anyway, i wasn't trying to be all smarty-pants, but if you know the math behind things, then you can figure stuff out and not just have to guess... uh yeah. that's it. have fun!
