er, this is complicated but worth the bother
Download a car - it might be in tga format
Download a program - i recmomend CSC4. Load the porgram and open the "cars.wad". Extract all the contained tex to an empty directory. Then use CSC4 to open an individual tex file. Then import a tga to replce the text file.
Do this for all the cars u want to replace, then save all the tex files. Recomplie the cars.wad, and place in gp4 directory
Im sorry this is kinda sketchy, im bustish atm, someone else will explain any question u have.
Racing Is Life. Anything that happens before or after is just waitingJesus may be able to heal the sick and bring the dead back to life, but he can't do shît for low fps