and for my 2c worth
your engine is making tapping/ticking/unusual noises and u want to increase the boost on it....
I would not even consider it until i have fixed the problem.Yes it may be noisy tappets but it could also be other more serious things,get it fixed before u increase your boost.....
What other mods have you done...
with out supporting mods increasing boost wont really do much
your mod trail should look something like this. Exhaust make it free flowing as much as u can,intake clean it up make it breath,then boost.....
Also maybe look at brakes as making it go faster is all good but making it stop and handle better makes it quicker....