BTW, the quickest tricks to pull are to used resistance, zener diodes to ground or inline diodes to trick the PCM into believing it is getting cooler air, lower temps, etc.; to keep it from degrading performance.
Having said that, ground paths are critical on cars with the level of digital (especially CMOS) circuits as the GT has. If you decide to go the route of "altering" the sensor output, be sure to make all connections both solid and protected from the environment. A compromised ground can cause a "loop" that gets worse with each cycle; eventually resulting in a complete malfunction that may create an ASD (Auto Shut Down) of the circuit under "test".
Good luck, and keep us posted...
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