I haven't been able to find a lot of information on replacing the fuel injectors with higher flow units that will work with the factory fuel rails. or information on flow rates, part numbers, etc.

Same with the different OEM throttle body options available for the 5.3/6.2 models. Ive seen Members discuss the LS2 throttle bodies, gold blade, etc. Wanting to know which ones are direct bolt ones without changing the wiring, HP improvements, etc. Here's a site for information for others wanting to learn about some of the differences: http://www.thelsxdr.com/ls-throttle-body-guide/

Currently working on a 2013 5.3. Deleting VVT, AFM, etc. BTR Stage 2 cam kit. Longtubes, No Cats, etc. Otherwise stock internals.

Thanks!

 

Both throttle body and injector changes will require changes to the tune. Your factory throttlebody is a 87mm so going to a 90 won’t gain you much if anything at all on a mild setup.

 

Is the truck flex fuel or non flex fuel?

The factory flex fuel injectors will do something like 450-500hp NA because they are like 38lb/hr. More than enough for the mods done to that 5.3.