Hope this isn't a repost...
I found this on the Sportec (http://www.sportec.ch/) site:
"SUV World Record 308,435 km/h"
They did it on tuned Cayenne - Sportec SUV SP 600M
Here are some photos, but you can find more of them on
http://www.sportec.ch/de/produkte/ga...sel.cfm?gid=20