I have a 2011 Suburban, with the standard 5.3L. What can I do to get more horsepower and torque for towing my 5KLB trailer? Any ideas would be appreciated. Thank you.

 

One of the easiest is a Performance Chip
Many here have installed one.

Here's a link where you can read conclusions on several...
Chevrolet Forum - Chevy Enthusiasts Forums - Search Results

 

Well, higher flow exhaust, better intake, swap the heads, intake manifold, better cam, exhaust headers, bore and stroke, etc. Same thing everyone else has been doing for the past 100+ years.

Get a chip, cold air intake, and better exhaust and see how that works for you.

 

Thank you. I already have a cold air intake, just wasn't sure if anybody had luck with other items like exhaust or a chip. thanks.