A Trigonal Baffle-Board?
Don't panic about it if your car's soon to be re-registered though, they're on sale when you take the car in for inspection.
State of the art, technologically advanced yet they cost only Dh30. And they look like this:
Well, like this when they're twisted into shape:
It's not only a Worthy Thingamy, amazingly, it Protects The Whole Shoot.
I know this from the helpful information on the box.