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SCT Extreme tune?... Sorry, can't help you. I've never even heard of it. You're still having tuning issues?
I'm not sure but I believe Extreme tune was used for the older Xcal's to change the parameters... I just thought it would be cool to mess around with, but I don't think it can be used for ll3 tune files.
i'm not really having problems anymore, I just thought It would be neet to mess around with