The bump @ 4,250 for the FP20G is interesting - I have not seen this before on the Matrix mustang. Kind of makes me wonder if the timing wasn't quite a bit more aggressive for the 20G vs. the Green. And, incidentally, that happens some times: some cars can take it and do just fine, others won't, and it ain't the turbo.
Also, these numbers (both turbos) are about 30 higher than PDX gets on the Matrix for these snails. Does anyone know what the STi baseline numbers are on this dyno? (And, no, not all mustangs are equal...not by a long shot)