Whose X5 is this?
 

While watching an R35 GTR clip,

I noticed an X5 ran a 12.8 next to the GTR. What's the chance for someone here that owns it? I'd like to know what mods has been done to it.

Thank you

YouTube Link: Nissan R35 GTR 9.7@142 (730awhp) Stock Motor - YouTube

Could be a stock X5M!

WOW, respect!

Loads of respect! Stock 555 bhp /680 Nms and a 12secs 1/4 mile and 0-60 mph=4.2 secs.
So,the one in the drag race was just stock???
I re-mapped a few to 680 bhp /800 Nms!!!!

NOT! X5M was never produced on the E53 platform.

EDIT. My bad, just re-viewed, not an E53 platform.

Definitely X5M with some sort of upgrades

The X5M on the video did 12.8 secs/1/4 mile ,which is the claimed figure by Bmw,so doudt if it has any mods!
Seen them do easy 12.4 secs stock and 11.8 secs re-mapped!

Bet this one would give the GTR a run for its money. Bmw X5 le mans V12 LMR engine 700 hp by Hans Joachim Stuck - YouTube

How much weight would it have?

That Lemans V12 X5 is smoke'n. I would have chosen the 4.6IS rims for it personally but what a machine. It's too bad there aren't more videos available on it.