What sort of modifications to cars are dangerous?

Question

What sort of things comprimise safety - do you have any personal experience of this? Are things like alloy wheels and spoilers perfectly safe?

Answer 1

I remember hearing that there were a lot of carjackings in Mexico in the 80's and that some guy added a sword-type thing that would swing out from under the driver's-side door to take out any potential carjackers.

Actually, I just found this article. Take your pick of poisons!

Answer 2

Just about anything that you do to alter a car from its original specs can be dangerous.....

Answer 3

hmmm. maybe lowering it, which a lot of people seem to like doing in order to make their cars look like sports cars. adjusting the springs and lowering the car too much messes with the ride as well as increases the risk of destroying the front

Answer 4

alloy wheels and spoilers are perfectly safe.  exterior modifications are for the most part not dangerous.  where many people get into trouble is messing with the parts that make the car go, stop, and turn......without knowing what they're doing.