2011 LML 2500 HD Mods?

Just recently bought an LML. Completely stock. I ve grown up with duramax s working with my dad & what not & love the duramax in its entirety. My question is what are some healthy mods for the engine? Not too big on making it a race truck, but rather use it to its full potential as far as sounding nice, handling nice & looking nice. Ideas like tire size, specific type of things that I should replace are greatly appreciated. I ve read about the EFI, dpf delete & what not but will it be worth it in the long run? Thanks in advance.