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Its possible but not worth it, simply due to weight(electric motor+cap/bat+drive) and other way of making more power cheaper/easier.
KERS(at least mecanical one) are use for specific usage in specific race regulation, not as efficient in the real world.
As for voltage or type of voltage, there no really link with the power an electric motor give, its mostly all about want kind of caracteristic you want from motor and how it is built(High amperage generate more heat in component(loss), so best to keep low by having higher voltage).
I think, if I would go for some crazy design(did not say its feasable) for higher power in short burst, I would start by having directly an electric motor that replace the drive shaft(weight would be low as for gravity), possible torque(due to large surface) quite high, could be use as regenerative device, since connect directly with the rear tyre, or with the engine when clutch engage, would not put more stress on the engine. And would not take any efficacy(MPG) out of the current system.
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