I find that my foot gets heavier than normal in order to achieve maximum boost in each gear. (mechanics.stackexchange.com)
Compared to other 1.5 - liter Civic turbocharged engines, which have a 10.6:1 compression ratio, the Civic Si has a lowered 10.3:1 ratio to allow it to reliably operate at a higher maximum boost pressure of 20.3 psi (16.5 psi on Civic EX-T). (hondanews.com)
Also there is EJ255 version with the increased intercooler and with maximum boost pressure 13.5 psi (0.93 bar). (mywikimotors.com)