rip the fucker off... then park on some nice tall dry grass... ha.

On some of my past cars i've had the shield start rattling and usualy i just take a tin sip to it. You won't lose power. In fact, it wont do much of anything. Enjoy.

EDIT: if theres nothing wrong with the shield and you are just asking for bs reasons... there would be no advantage or disadvantage to keeping or getting rid of the shield.