That's not the same finish as the GTR posted. Not even close.
I don't know if the GTR posted is photoshopped or not, but it's certainly not covered with the same finish as "fiddy's"

Murcielago..........
I know that because I've just been through 3 months of hell trying to get my new BTCC style Civic Type R completed in the same finish !!!
The M3 is done with a special bit of kit made by the same company that made the finish on my Civic. Mine is called Mirror chrome and it's laid over black as others have suggested. The M3 was done with Chrome effects which is a proprietry finish using special equipment to put it onto the car, not sprayed like Mirrachrome is.
I think in the right place, they all look awesome............... The full bling bling chrome is a bit full on for me, which is why we dulled mine down a bit, but even though it looks really reflective, it doesn't reflect direct light like headlights any worse than any other silver paint so it's not illegal here to have it..............gives the effect without the downsides.
I think the full chrome effects job would probably reflect like mad, but not the mirrachrome I used.