Tuner -Bully dog GT Platinum 40417 $300Purchased 2 weeks ago , Put a tune into my 2011 Chevy Silverado 5.3 With 201000 miles and the diffrence is, well i get 18 mpg vs 14 before, and the torque and hp gain is very impressive to say the least. This Gadget has Calibration for Different size wheels, Pick your shift points, Rev limiter choice, Do away with AFM, Do away with A govern Of 104mph, choice of transmission shifting, I put a performance tune into my truck and i am more than satisfied so i dont Need this anymore. Also when i bought this, I couldn't find the SD card right away so i called them and they sent another one, in the meentime i found the other so there are 2, This is in Hazen txt me 4257727