Don't quote me on this, but the purpose of the intake air temp sensor is to measure the temp of the air coming in so the ecm knows how far to advance or retard the timing, because if your getting really hot air in it won't advance timing as much as if it was cold air because it doesn't want to bring combustion temps to high and cause pre detonation. By bypassing the air temp sensor and tricking the ecm to think the air coming in is always cold you'll get the maximum timing advance the ecm will send, now it's also going to look at the coolant temp sensor as well, but it should advance timing at least a couple of degrees throughout the rpm band. But of course you'll need to run higher octane gas in order for this to work otherwise you'll have pre detonation.