Progressing at a slow rate? Certainly not on the 54 side....
As to why folks aren't putting proper turbos on 55s; it's almost entirely due to software limitations. The hardware is easy, but flash control over the DME is so limited on the E9x N55s and even moreso on the F3x 55s. Oh and for whatever reason, the 55s seem to get cranky with ethanol.
Tricores aren't easy to reverse engineer.....If someone wants to go buy a MOTEC or Syvecs, they'll be in great shape. $20K poorer...But in great shape.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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