Built a pressure tester to find the boost leaks, got rid of all the leaks but still feels like boost leak and lack of power on higher revs. So i pulled off the turbo, intercooler, pipes/hoses. Found some pieces of metal inside the intercooler and engine oil has turned black(just serviced about 600km's ago). Turbo has a slight shaft play inside-out but not side to side, cold side wheel looks a bit rough. Drained all the engine oil, luckily didn't found any metal pieces from oil. Apparently turbo was just replaced before i bought the car so might it be that f**kers blew the old turbo up and didn't clean the intercooler??? Still doesn't explain why I get 15psi of boost and that sucking noise like a boost leak+ stalling when turbo is supposed to kick in. Might need to start looking for a new turbo...