I installed my cathodes this weekend, didn't drive until this morning on my way to work. The tube on the passenger side rattles. It isn't the mounting, it seems to be the rod inside the tube. Is this normal, or maybe a defective tube?

 

the tubes can move .... but i've only noticed it when actually rotating the connector at the end of the case ..... i don't have any rattle from vibration ...... probably the connection isn't tight ... ie defective tube