okay so i heard something rattling on my 2008 2.0L caliber. i walked to the back of the car where the rattle was strong looked by the evap can and notis this heat shield on top of the muffler rattling away i touched it it was cold and pulled it out like nothing. i see 4 bolt hole and they looked like aged and cracked on the hole. i guess it just fell off is their any downfall to not having it on ? will something blow up? is it important or should i just leave it alone. i mean it does not rattle anymore which is a plus.