I've been searching to find specs on the ba , bf , and fg turbo . From my search it seems ba bf are the same and fg is said to be a smaller turbo by some . Others say the turbines are the same on all 3. comp 61.4-82 trim56 turb 68-84 It seems that the ba is comp .7 ar and turbine 1.06 ar and the fg is comp .5 ar and 1.06 turbine. So from all my searching I think they are both the same turbo but the fg just has the smaller ar on the compressor. Any help on exact specs appreciated as I have found so much conflicting info.