I need opinions on the best power programmer on the market for a 2007 Yukon 5.3. I like the Edge Evolution because of the mounted in cab display, and have heard good things, but your opinions is what I need on whats the best. I do have A K&N Cold Air intake system I want more power and to be able to adjust shift points comp. for my larger tires etc. I also have no emmisions test or DOT inspections to pass in my state. I know using a software progam and a laptop is probably the best way, but I dont want to go that route. I would also like to find out what you guys think of a throttle body spacer any benefits and is there one that does not whistle Finally, one more thing. An exaust system to go with the intake and a programer. good free flow without a drone sound in the cab and not much louder that stock unless gettin on it.