get yourself a front mount intercooler and hks actuator, then you can up the boost to .7 of a bar... a good mani is needed to up the boost tho or you will fry the engine cause theres a restrictor in the 3rd runner in the stock mani and it creates to much back pressure while upping the boost, also, to exceed .8 of a bar of boost you will need different managment, fcd/fpr and on a rollong road to check the fueling or a aftermarket ecu