Has anyone upgraded the exhaust or found a programmer to give this setup more power? I have LTZ Package 4X4 and don't feel like I have the power it should when I put something behind and pull. The first this is the towing fuel efficiency goes out the window down to 9-11 mpg with only 5000lbs.


If anyone has done any of the upgrades please advise. I am not very happy with this setup so far.