My freelander undercarriage makes a terrible noise when driving?

I'm interested in buying Freelander 2000 from a friend, test drove it and it was making an awful noise when driving, could it be exhaust bracket or would the exhaust be loose, when looking underneath I can't see a prob with either.

Wondering could it have been incorrectly fitted and never rectified, the buyer said he took it to many a garage and they can't find out whats wrong with it. i'm baffled.....