under-carriage plastic shroud...?

[stickball]

Hi Everyone. This is my first post, so please forgive my ignorance if this has already been covered. I'm not sure of the name of the part I need, so I'll describe it; it's a large sheet of molded heavy plastic that is bolted to the underside of the car. It protects the oil pan and the bottom of the motor. I was stuck in the mud recently, and when I was finally able to extricate the car, this bottom shield had broken off. I'm finding that the interior noise level has increased significantly and I think I'd like to replace the shield. I just don't know what it's properly called, and so can't identify the part to order it. Can anyone help, please? Thanks...

[kenney]

noise insulation tray

[stickball]

Many thanks, Kenney...

[pauloliver]

is it really necessary? mine decided to start falling off the only time i bother testing out my cars top speed (125 out of a 90bhp diesal) and so i did a road side repair by ripping the bugger off! i still have it but refitting it seems a waste of time?