I used the turbo calculator on this site.
http://www.not2fast.com/turbo/glossary/turbo_calc.shtmlMy plan was to have installed an intercooler by now. I have a larger compressor wheel that will be installed along with the cooler and water meth. I don't run 20psi for extended periods of time. It runs pretty efficient anywhere else. Cruises 75-85 mph right around 3000-3400 rpm 3-5 psi and about 650-800 f EGT on flat ground.