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The blower part of a hairdryer uses 70W
The heating element part uses 800-1500W of power.
This is not insignificant for your alternator.
You would be better off having a valve drawing directly off your exhaust manifold. Or some kind of heatpipe that you can transfer the heat to the intake. gain you would need some kind of control mechanism for it.
I dont want to sound like i am pushing my own thread, but i calculated the energy requirements for heating the intake air in my steam injection thread.
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