no helpful info. other than i bet that 6 blade wheel sings! can i have one??? being serious now, from what i have gathered is the 11 blade or "full blade" designed wheels will make boost quicker, but the downside is the full bladed wheels choke out quicker than the split blade designs, limiting the map width(hope that is correct....), if the turbo(s) are matched correctly, i would say go with the 11 blade wheel, depending on the use of the s475(twins or single), if what i know is correct, the 11 blade would be better suited for a twins application, where the wider map of the 6 blade split compressor would be better as a single. turbo guru's if i just spit out a bunch of garbage, my apoligies, and please set us straight....
Wes