I have the GTS tune that was done by BIM Coding out of Seattle. His website and FB page are down now though so I'm not sure if he's still around. I can't remember his name either.
GTS is worth it. Starts in D2, removes some of the 1st gear stutter (unless the transmission is very cold, then I still get some lurching). Smooths out the shifts 1-3 and makes 4-6 more aggressive under WOT.
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