i pulled 140 MPH in a 4.6, reading by speedo, not verified by GPS. I backed down, as I was scared sh!tless but the truck had enough juice to go faster... not sure how much faster though... no incriminating video, and lets say it happened a long time ago in an undisclosed foreign location... lol... the 4.6 was bone stock...

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E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X