got a 13 LT Z71, K&N cold air intake, just put a corsa sport exhaust on, have a ranger plug in to keep in V8 mode. Looking for alil more pep in the step. Throttle response is ok, seems to rev & shift now at higher rpm (longer time before shifts). Notice alil clucky, (not all the time) from driveshaft maybe when backing down. gas is round 14.1 - 15.8 mpg depends on how much highway driving. short highway ride to & from work everyday less than 20 miles. Just looking to maybe chip it or get a tuner. Any recommendations out there from you all that have done this? Dealer serviced, pretty sure i voided their drivetrain coverage, with the CAI & exhaust. Wondering if a tuner is a DIY or take it to someone who does this for a living type of thing?