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I apologize, I just dropped to the bottom response so if this is redundant then I apologize. Active Autowerkes's does have a magnificent Z4 tune for the 3.0i available for $500. I purchased it and absolutely love it. But the real cherry is that working with Nick ( the actual programmer ) or one of the Hugh brothers, ( the actual founders of AA is such a positive experience it in my humble opinion is the way to go since it is so easy to then have AA deliver another tune at a reduced cost for any other mods you may do. They are stellar fast at updating your exacting mods into thier personalized tunes it is incredible and they are so willing to do it too. Hope this helps.
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