God and Jesus (sorry, meant Scott and John). Yes, all Garrett upgraded turbo's were once on a diesel, but I seriously doubt that there was ever a 57 trim E compressor on a .48 stage 3 turbine used in production. So technically all of you are correct (although I'm sure Tony knows this but figured its such basic knowledge it need not be brought up). If you look at OE diesel apps, they all have reletively huge turbines compared to the compressor.