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Feel bad about asking this here but this thread has lots of activity. My Gruppe S header is sitting on my coffee table, begging to be bolted on. Problem is Ft86speed factory took 5 days to ship my OFT and now it won't get Here till Monday/Tuesday. If I go ahead with the install tomorrow, will it mess with the stock tune and thus the OFT will save a sort of ill-running stock tune when I plug her in upon recepit? Or should it all be fine and I just go ahead and install header and flash when my OFT arrives?
Thanks for any answers and sorry for asking here....
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