Dumb exhaust question

[Cubieman]

That definitely should not be there, very odd, it's rubber?

[Leafsrule531]

Okay so I have a dumb exhaust question - I have the stock m3 exhaust and for some reason I just noticed today that’s the right side of the exhaust is blocked with some rubber. The left side doesn’t have this. Is this supposed to be the case or did someone try to mess with me ? First pic is the right side of the exhaust. Second pic is left.