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GIAC is custom tunable from what I understand. Obviously Evo can't do it without your car so getting your money back is a good idea. Did they offer any kind of guess as to why you're getting the results that you're seeing?
I believe there's a member on ppbb that has the exact setup as yours. He went on to dyno everything too and had much better luck. I think his name is Andy. You might want to do a search over there and talk to him.
Lastly, you might want to ping Garret @ GIAC. He might be able to offer some suggestions on where to custom tune over there or give some insight as to why you're seeing what you're seeing.
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