Quote:
Originally Posted by serper3
yes, there is info as to how this works if you google it. they use a check sum. if any data in the stock tune is modified the check sum value returned is different.
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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.