Things changed:

-Real weight
-Real 4x4
-Real steering angle
-Lifted Suspension
-Real speed I guess
-Real Brakes

Installation:

-Backup your original handling.meta
-Replace handling.meta from: Grand Theft Auto V\update\x64\dlcpacks\mpheist\dlc.rpf\common\data


/////There are 3 types of lifts to choose from. Check screenshots :P
v1 Black Insurgent
v2 White Insurgent
v3 Red Insurgent