EVOFans , nah bro , u got it abit wrong
sorry if im wrong , u can see this
http://www.ztechz.net/sitebuildercontent/sitebuilderpictures/td05h-16gsmall-cfm.gif
http://www.ztechz.net/sitebuildercontent/sitebuilderpictures/td06h-20g-cfm.gif
above 2.0bar , u will loose performance n not gain anymore
both td05 and td06 has its max cfm at lower PR
those are the compressor flow map :)
it looses it efficiency above 1.6bar i guess which means
boosting higher than that bring no extra performance
td05 max at 550cfm while the td06 at 640cfm
420whp on stock evo turbines i dnt think can be achieved