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2009 CTS-V, 2008 STS-V
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I'm looking to do the same here. GP Tuning in Hayward comes up. I've been in contact with them and got some quotes on stuff. PM me if you're interested in that info.
 

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I've had a really good experience with Matt from GPTuning (lt1z user name). He's really good and will get the car right.

I also had a previous tune from Synergy Motorsports who is now in Livermore I believe. They did a decent job but didn't get the steady state cruise all that smooth. I took it back and they did some tweaking but it wasn't as good as the tune that Matt put in there.

Highly recommend GPTuning.
 
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