Oh stupid me, I was using the "Trafficflow" mod before...
Thanks to you, its now working somewhat properly, I just seem to have a lot of items popping up late, should I try to fix this with lowering the density of the cars around me, or is it something else?
I also figured where the radar.img file should be put in, so thats not a problem anymore.
I'm going to play around with the Vehicle Mod Installer now, but still I don't know how to edit the cars handling to make them not spin around anymore. I've made a list and there are a total of 51 cars affected by this, I still dont get why fiddling with the models affects the handling of the cars, thats just stupid... Maybe I need to add that I'm not using any custom handling sets, even IF they would be included in the carmod, as I hate when the cars are uber-fast, and I would like to keep the ingame performance of them.