One of the most common, and least appreciated, effects is the inability of a reflashed car to pass modern "advanced" smog testing (read connect with the OBD II system and read) now required in many states. We have had cars ranging from 986 Boxsters to 996 Turbos that failed these tests after getting the DME "flashed", and the only way to get them through was to take the DME back to stock programming. This used to only happen once in awhile, but is now cropping up more often, apparently as the state systems get better at noticing something is different.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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