[scooder]

That seven pounds is just guess work, not an accurate number. The amount of boost pressure in any engine is dependant on lots of things, tis only a ball park figure. You have to measure the pressure on the engine it's gonna live on. So be sure to fit a pressure guage to see what your actually getting. If it goes to high your heading for expensive parts bills.
Out of interest what's the rest of the engine spec?
Martin.