It does sound high for those mods, but then a lot of people wouldnt run 18psi on a standard cooler !!!! As the boost is so high it may have 180bhp but not for long, if you get my drift Get a good intercooler on there and a cam then it will be around 200bhp, a stage 2 turbo would benefit you as well !

As for the internals, nothing really increases the power, people fit forged pistons and steel rods for reliability, theres only so far you can push standard stuff !

Duncan