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A supercharger hooks up to the crank to charge in like 10 psi, a turbo charger rotates almost 10-20 times the rotational speed of the engine to generate like also 10 psi..
I'm not sure a fan that hooks up to your battery can charge in 2.5 psi, just doesn't make sense you can give it a try though and let us know.. I mean 2.5 psi for $300 would be THE bang for the buck mod.. just sounds too good to be true