roof spoiler huh?

three simple questions

how does a roof spoiler work?

Is there any advantage to having roof spoilers as opposed to regular spoilers?

Why is it on the top of almost all rally cars?

I guess while Im at it...

where is a despolier located and how does it work

What are you on about?
Where is it on top of most rally cars?

Are you perhaps referring to the roof scoop they use for air intake to help cool the driver?

Guess his curiousity was short-lived ...

my bad, Its not a spoiler its a roof scoop. I had a feeling that it was made to bring air to the cockpit but wasn't sure. thanks