Need some input Tuners - Exhausts

Mulligan

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Hey I just bought a 07 denali 6.2L awd 125k on it, I use it to tow small trailers sometimes but mainly just to cruise. I'm new here, and I am sure that this has been a topic in the past.

What tuners do you guys use, is there one that is better to help my gas mileage? Currently it is full stock, its in the shop now and getting a new cat back installed(insurance so not sure what they are going to pony up for yet) So also looking for suggestions on exhaust also.

So looking for a exhaust that is comfortable to drive daily, don't want a loud drone all the time but want a little more beef when I get on it. And a tuner to help improve gas mileage. Any input is appreciated! Thanks guys!
 
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