Cars overseas have claimed to have their turbos upgraded and they likely have upgraded OEM housings with new wheels similar to this setup. The tuners that do offer turbo upgrades tend to offer them as part of a package.
A 991 Turbo owner could in theory purchase these impellers and do their own tuning and own fuel system upgrades instead of having to pay a set price for an entire package. That sounds great, but where is the data?
Cobb is said to be helping with the tuning of these but without any actual concrete info including pricing who is going to pony up for this upgrade? A dyno plot at the minimum would do wonders.
Either way, expect more turbocharger upgrade options on the horizon for the 991 Turbo / S platform.