Everything about driving a vehicle. Most changes increase speed, power, change the way handbraking/drifting works; includes changes similar to the angular dampening mod~flipping and crazy quick physics during crashes; changes camera FOV during acceleration; larger trucks can crush other vehicles; motorcycle handling (mostly); some mass changes; a few vehicles gain climbing (Bulldog, Criminal, ATV, Mongoose...); cyber bikes crush vehicles (and jump them in the process, kinda fun); some vehicles have changes to audio, some had to be made to fit acceleration and audio_onload_parameters (some audio limits top speed: the "Betsy" audio, for example, does not allow the vehicle using that audio to get above 100...Hard coded I suppose, "Bootlegger" audio was changed for this reason); heavy land yachts have "heavy" status now. Big trucks tend to build momentum, and top speed could be dangerous...to everyone. I tried to keep all changes within some kind of immersion fitting to the game. Monster trucks act more like monster trucks, jump vehicles while crushing them, bouncy landings. I don't have plans to touch tanks, helicopters, planes or alien hover/aircraft. There are like 150+ vehicles, most are W.I.P. Maybe 20 are finalized. The changes I have made are quite drastic in game. I've noticed that some vehicle's top speed may have an impact on performance, at least on HDD. SSD might help. I run a RAID0 on three HDD and sometimes loading what to render doesn't keep up.