They're totally necessary, especially if you're a self proclaimed track hero, same as remote starts, so you can start your car whilst you finish brushing your teeth in the morning.

Save the money, get some mudflaps as these are a legitimate useful modification...
They allow you to drive on work sites with limited risk of getting your car dirty

They are also a polite gesture to the people tailgating you, implying that you don't mind how close they are whilst travelling in convoy, you will not flick stones at them.

But if you're still after the fully sick look of walking away from your running car this might help.
https://www.youtube.com/watch?v=ZaiB...e_gdata_player