There a kinda mix of ceramic and plastic :confused
They still don't take boost either way, you'll find the impellar bunged into the cat core like all the rest
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All RB turbos are ball bearing, hence the Oil Feed banjo restrictor being so small.
RB Neo Turbos have a plastic compressor wheel and ceramic turbine wheel, this is why they spool faster than the earlier turbos. They also have a bigger exhaust housing than other RBs. You should get 1 bar safe on any RB turbo.
no not all RB turbos are bb at all..!
in a perfect world id get a RB25 neo turbo redone with steel internals ... But a normal rb25 with steel internal will do you nicely...