One of my fren boosting his vr4 at 1.8bar TO4E turbine with stock piston,conrod... also no problem, the most important is the fuel supply must enough than the engine can last long , won't kaboom so easy one lah ! just clarify .. I m not mitsubishi user , I drive toyota, but I think all turbo engine have the same basic theory,EVO3 is a strong engine, stock already can go very high boost .. my opinion only ... don't flame me ah !