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Message: <blockquote data-quote="#BrownRoush" data-source="post: 1409515" data-attributes="member: 10990">Got a question for those that live in California. My car is an 01', so I just have the smog for me is just through the  OBD2 port.  I plan on upgrading my rear gearing to 3.73's, which will necessitate either a custom tune or a modification of the stock tune. I know a custom tune will fail the car smog wise. I'll try to explain this the best way possible. If I modify the stock tune, then just re-load the stock back up, will the smog shop be able to read/find out that I modified the stock tune? On my past cars, I have dealt with the whole "friendly" smog shop bs, and I just don't want to deal with it.</blockquote>