I was reading threads about trifecta tune and noticed your sig that you have it and that you also have the 1.4 6 automatic. My problem with my '12 LT1A 6A is the freaking gear shifting. First 4 gears the car jerks and it's oh-so-irritating. My question for you is, have you experienced this problem in your car prior to the tune and how does the tune affect the smoothness of the gear shifts from 1-6. I'm not overly concerned about power gains (everyone seems to be talking about it more than transmission benefits), so I'd appreciate if you have anything to share in this regard.