whats up? I was thinking of building a b20/b16 motor on boost. My friend has an audi a4 1.8T and he is upgrading his turbo so he said he would give me his. Im not sure about the specs of the turbo but its the stock factory one with internal wastegate. Anyways i plan to have stock b16/gsr head (would it make a big difference on how much boost i can run) and stock b20 block and i was just wondering how much i should be running the turbo at? Like has anyone had experience to what safe psi and maximum psi should be run with the stock internals?