The cost associated with doing those "performance mods" would go a long way toward a re-gear.
As mentioned by other savvy Jeep owners here, none of those will really enhance your performance.
I had Toyo Open Country MTs on my JKU and couldn't wait to wear them down so I could replace them with the BFG TA KO2. The noise and ride on asphalt was unbearable and only got worse as the tires wore. So yeah, not a fan of mud tires on a DD.
Performance mods I would consider for a 3.8 auto would be limited to fuel injection, gearing, headers.
