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In top gear only it seems. I'm sure one could downshift and get better times, but it is a controlled measurement of lower rpm performance perhaps.
It seems that a proper one could be used to downsize an engine for more optimal hiway mileage while still getting ok performance. If it doesn't look like a motor bolted to half a turbo then it is probably junk.
I expect that one could do something like part turbo, part electric supercharger, part exhaust driven alternator too.
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