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Warm air helps vaporize fuel, allows the throttle plate to be open more and it takes up more space so you end up with slightly higher compression ratio, so if you want to build a thermostatically controlled warm air intake look at pretty much any carburetted car and you will find a warm air intake tuned to about 110F.
The Toyota Echo and first generation of Toyota Prius share a great deal, alloy wheels and low rolling resistance tires will help you with better mileage, not sure if the prius had a factory belly pan or not, but the that first generation prius apparently had some issues with the electric drive motor, so you might get a good deal on wheels and body parts if you check around.
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