kris shirley

I am looking for advice on the best short tube headers and CAT back exhaust system that will bolt on. I am not looking for annoyingly loud, but something that will help pull my boat down the road, while still maintaining the luxury feel of the Denali. I do plan to do a tune once the upgrades are done. I have the K&N CAI for her already, but I am have seen so many options, I'm just looking for someone who had a similar engine and if they like the mods and would spend the money again! Thanks for your help!!!