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It wont hurt, but probably won't help too much either. OEMs kind of do this already. With port injection engines, they typically aim the injector to spray onto the intake valve which is quite hot to help vaporize the fuel. In throttle body injection which is pretty old tech theses days, they warm up the throttle body to help vaporization through the intake manifold similar to a carburetor. Direct injection I don't think warms things up, but its being shot through tiny injector holes and injected at massively higher PSI than the others. So vaporization is less an issue, plus being injected right into the combustion chamber helps vaporize things quickly.
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