Yep - A really high-frequency sound when you are standing at the rear. I've never figured out what it is but I don't think it's the same sound as the guys on the other forum are talking about.
Check out this Aust. review video of the KL. You hear the noise between 1:37 and 1:41.
http://performancedrive.com.au/2015-...ew-video-2010/
If you figure what it is, can you let me know.
I'm not that concerned about it to be honest though.