New Red+Big A** Compressor housing=
Mainly it gaines quite a bit of usable flow left of where the normal surge line is which would require the turbo to build boost quickly and at lower RPM's to even utilize. The slight negative impact they are referring to is moving the efficiency islands (red lines in graph) to the left including the choke line at max flow but it seems to be well worth the tradeoff for more usable range. I'm pretty sure there is no spool penalty associated with the ported shroud, not sure where you read that.
That bullet nut is a great idea and should make the efficiency islands wider again and reclaim some of the lost max flow capability at the choke line. Be sure to post some results once you get that new turbo installed!
I will post results of turbo after i install it hopefully this coming up weekend it is going on and I will try a before and after as the shop changed dyno's so my old graphs will not serve for relative comparison
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