It looks incredible, but according to its developers, Grand Theft Auto V mod The Pinnacle Of V has much more going on than just a graphical polish.
Vehicles have been reworked, with supposedly more realistic handling, physics, and AI driving.
Relationships between the game's various groups of NPCs have been tweaked to enable more emergent encounters, like battles between gangs and police, and population numbers have been increased across the board — particularly at rush hour.
Weapons have been completely overhauled, with more realistic handling and bullet physics, while more environmental elements have been rendered destructible.
And of course, graphics have been improved all around, from revamped weather effects to 4K textures to more realistic fire behaviour.