id go bigger injectors and a second hand fmic kit.if its a highflow turbo u should also run more boost and should achieve around 250kw on average with a safe tune which is around the 350hp mark but the power ur making at the moment is easy power for a stock turbo and anyone with a highflow and after market ecu should be making more than that so if i were u id be double checking u definatly have a highflow turbo before u go running more boost and getting a retune