How do i change collision setting on tdm vehicles?

I currently have the car dealer up and running well, but when i spawn the cars they are in nocollide by default and i want them to have collisions. I found a similar thread on the drp forums: http://forum.darkrp.com/threads/tdm-cars-no-collision.3928/ where pab14567 says its in settings but thats way too vague. I tried settings.lua and theres no option there