I have a 99 PSD, CC, 4x4, automatic, with right at 100k miles on it. I'm thinking about putting a Banks 6-Gun Bundle on it which includes the programer, Transcommad, 4" Exhaust, and Bighead wastegate. I also am thinking about the Power Elbow, and extra Guages on an A-piller mount. Does anyone have any experiance with these products, and will it make a difference on my fuel milage? Also, what are the chances of it damaging my transmision. Any advise will help.