+1 for Kirk at Vector, he just did the Cal in my 04 Sierra, and i've had no issues. It's a truck, so i wasn't expecting blazng power, but it did wake up the truck for a 87 octane tune, and i would definetely go back again.

I hear he is doing amazing tunes on the new G8's, and he does do alot of tuning and dynoing for Katech.