I don't know specifics, but I know the Ford VGT rusts up causing the vanes to stick or lag resulting in under/over boost codes and derates. There are companies that make turbos with better materials resulting in less rust. I would stick with the VGT though unless you're really doing some mods. The VGT allows for performance acrossed all RPM ranges.
Last edited by ThinICE; March 3rd, 2012 at 09:57 AM.