Ok, here we go. New to the forum but I have had my 2003 Z71 for just over a year now. Never had a real question before but now I do. I have an approx 6500 lb loaded up travel trailer. I have towed it with the Av a couple times and it does ok I guess. The Av was always the backup tow vehicle as my wife has a Nissan Armada which is an absolute beast as far as power and towing and the Av is just not. No offense to hardcore Av or GM truck guys but I'm pretty sure nobody ever claimed the 5.3 is too powerful. Anyhow, now my wife is getting a smaller vehicle and the Av becomes #1. Anybody that has had real experience with doing mods with the purpose of adding towing power feel free to chime in. What do you suggest? CAI I believe will probably be the #1 recommendation and I plan on adding that 1st and probably will go with the K&N as I hear they are the best and I don't care about the look of it so don't need stainless, etc. Beyond that what? Hand held tuners? I have done this in the past to other vehicles and to be honest, was never really impressed but if you have experienced good things let me know. Cat Back? If so, which one? hate hate hate ridiculous droning in the cab. Don't mind a little grunt but don't want to go deaf towing 400 miles. Again, feel free to chime in if you have had real world results where you could feel a difference in the towing. Thanks all.