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And they can tell if you had one and took it off also. There is a seal were the harness connects to the ECU. And once that is broke. Will you know the rest.</P>
Hypertech makes a programable unit that memorizes stock settings and you can put your computer back to stock any time. It plugs into the diagnostic plug and not the CPU, so it is undetectable. I paid $375.00 but I'm sure you can find them for less.