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I think starting this thread was a great idea. This should give everyone that has done cold or warm air intake modification the opportunity to post their before and after results in one place. Maybe we can compile some data.
One point I would add to the original post in this thread. In most modern electronic fuel injected engines the ECU will use the temperature signal from the IAT (intake air temperature) sensor to advance (cold air) or retard (hot air) spark timing in order to prevent detonation. Because of this input to the ECU, any efficiency gained from the low density hot air going into the engine will be lost because of retarded spark timing. The work around this problem would be to manually control the input form the AIT sensor in order to trick the ECU to advance timing. This seems extremely dangerous to me.
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