I hope I'm not asking a question previously answered, but here goes. Yesterday, I changed my oil myself (yes, I've always taken it elsewhere before now) in my 2011 Limited Hardtop Convertible. Simplest oil change ever! While under the car, though, I noticed that all the plastic surrounding pieces seemed to have holes to connect an "under-engine" splash shield. I have no big plastic part under the engine, and it doesn't look like there was ever one there. Should there be?