Unless the Subaru version comes with more power or "something" significantly better than the Scion/Toyota version, there would be no reason for me, a die-hard Subaru enthusiast to buy the Subaru version.
Subaru's whole catch for most folks over the years has been AWD on all their cars. With this RWD sports car, the reason to buy the Subaru version would be an STi 300hp driveline in it.
As for aftermarket turbos for the NA version, we've been there and done that a ton of times over the years when we were working on 2.5RS Subies before the WRX came to the USDM market. It's a royal PITA and more expensive than it's worth for the subie engines in our opinion.
-mike
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