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If your car has a cold air intake, close it off and rout hot air from the engine into the air intake.
In a way, the air filter, and resonator box is mounted under the hood, where the air is very hot already. So it'll all work towards creating warmer air.
I wouldn't delete the resonator box. It's specifically designed to make your car run better. Without it, you'd be driving at sub-optimal air-fuel ratios.
You may be much better off, taking your car to a dyno shop, and tune it for high MPG, or buy tools to read AF ratios from the OBD2 port and exhaust.
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