Ok so was on normal town road driving along, noticed what i thought was a small rock infront of me, drove over it at roughly 30mph, and it sounded like it had smashed the underside of my car to pieces as it was much larger on the side faceing away from me, so anyway pulled over little further down the road to inspect and it looks like its missed oil sump, clattered down drivers side and smashed into the girder looking diagnal single piece of metal and smashed into plastic black undertray, nothing has came away so im wondering if this plastic undertray protects anything vital from water etc? Ill get some pics to help you see the damage and update this post asap.
Chris
Chris