lumpenst

for a citroen c2 vtr which has a 1.6 liter engine 110hp max rev 6500 and 11.1CR i'm going to build a turbo... i'll use double headgaskets and adecompression plate to lower the CR to about 9 and use t25 turbo to get around 150hp how much psi boost will i need approximately ??
i was planning for 7psi boost but after the compression decrease i'm not sure this would be enough for 150hp