Tuner for 2021 5.3L

[BassDaggett]

I bought a new 2021 GMC Sierra 1500 Elevation with 5.3L after my 2016 RAM Ecodiesel blew at 179k ... Yeah, I know its a Dodge.  No, I will never buy another RAM again....  That being said, I seriously miss the fuel mileage and low end torque.  I can deal with the fuel mileage, but I'm really looking to boost the low end a little bit when towing.  In the past I used a Diablo Predator hand held tuner on my 2009 Silverado 5.3L with good results, but I didn't see anything compatible on their website.  What do you use, recommend and why?

[SILVER SLED]

Have you checked to see what tuners are available for you '21?  

[BassDaggett]

This probably belongs in the Engine forum... I'll post it there.