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Bud,,,,,,,,,,,,,, Theres NO SUCH THING for a C5 OR C6.
Your ECU has a nonvolatile programmable memory. The ONLY method to alter the ECU parameters or to change the way they perform is to FLASH in the changes thru the ALDL Connection under the drivers dash.
There are numerous PROGRAMMERS that make limited number of changes and there are full tuning set ups like EFI Live and HP Tuners that can alter almost all functions.
Google Superchips, Diadiblo Sport, Hypertech and EFI Live and HP Tuners.
If you want professional tuning,, they use EFI Live and HP Tuners.
Please don't fall for $25-$100 add on or plug in stuff cause they do little or nothing for you if no damage your engine.
Oh,,,, By the way.... The Intake Air Temp Sensor (IAT) is just two wire in the MAF housing connector that provide (5 DC Voltage and a Sensor output Signal 0-5 VDC that is changed via IAT output using a THERMISTOR (Temp Controlled Resister).
So,, all the CHIP can be is 5 cent resistor that modifies the voltage output of the thermistor less or a simple circuit that increases the output of the thermistor. That my friend is no way to properly modify or tune a C5 or a C6.
Trust us... If it were that simple,,, NONE of us would spend the thousands of dollars that we do to make the LS engine perform better.