came off)? This protector apparently keeps road stuff from hitting the front underside of the car. It came loose, dragged, had to be removed. Replacement is $300 - do I HAVE to get another on?
The plastic cover on the undercarriage helps control airflow more than anything else. If you don't do much high speed driving, leave it off, you won't notice the difference.
I would say no, unless you drive in very wet and muddy conditions. If you just drive on flat paved roads and in no inclement weather, you should be fine.