In CAR CRAZE/TEXTURES/CARS, you can see that there are more rama cars than there actually are in the game. You can use these texures in the game just by renaming them to the corresponding file of a car that is present in the game. For example, if I want to use SURFER.MIP, I rename it to WARRIOR.MIP, SURFER_PIN.MIP to WARRIOR_PIN.MIP and so on.
Be aware that some of these textures aren't done very well; CLAW.MIP is a better version of SCRATCH.MIP (it has less errors in it), and BURNER.MIP is a better version of SURFER.MIP.
Some other errors I found:
GEAR.MIP's chassis texture is a bit messed up.
SURFER_PIN.MIP's color doesn't correspond to SURFER.MIP's chassis color.
Have fun! And you know, you can also customize the wheels texture for each individual car
By the way do you know how to change the player red helmet's color? Again, please do not double post. Use the edit button. - jamesster