As F5 coorectlyy pointed out, it depends on the make and model. Hypertech for example has an anti-piracy mechanism whereby it "locks" the flash chip after it re-programs it. on some models, you can read chip parameters but you no longer write, on other models, you can no longer read or write if GM uses their equipment. it also locks the unit itself (re-programmer) in the sense you can no longer use it on another vehicle unless you revert back to OEM settings on the first vehicle.
Dont know much about Corvettes and their re-programming procedures all I know is the 97 models had serious transmission problems.
SledgeHummer.
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