depending on the car it can work... like with the srt4, 16lbs of boost is still fine. I'm sure supra owners could do something similar. But like stated above as well, its uncontrollable. You are better off getting a MBC. 1.5bar is something like 22lbs of boost or around there I think? on the td04 you shouldnt be pushing much above 18psi, after that its just blowing hot air.