Custom Tunning Problem

Hi everybody.

So the other day I was thinking to myself: "How could I tune vehicles which can't be tuned?"

By tuning I meant adding spoilers, front/back buffers and that stuff.

So I though: "Why don't I just go in map editor, edit some components on a bullet and attach them to the vehicle with some easy scripting?"

So it works perfectly fine but the problem is that when I get close to pay'n'spray's, or to the police station for some reason, my game crashes.

I don't know if this is due to the components which I attached to the vehicle as objects or if I did something wrong?

Is there anyone that knows where the problem is, or anyone that has tried this before, to tell me how could I fix this?

Thanks in advanced.