Quote:
Originally Posted by Mac7504
The CAL ID and CVN just has to be unaltered from factory form, correct?
I understand piggyback units do not change not change those but I believe a complete rewrite may let's say with hp tuners will.
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No sure on the first line.
piggybacks are fine from what i have read, but, if the tech realizes you have something that changes tunning on your car you will fail.