Theres a bit about electric turbo's on the net. Using an exhaust gas driven generator, to charge a battery pack to power the brushless motor driven compressor.
THe actual concept is real and plausible, as for it being on a Subaru... who knows?

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Its just the internet dude, its not real.
F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i