I am the friend francobaresi mentioned
Have the same car, 2007, 110k km, its also remapped to 190hp 400nm
I have the same noise:
starts at around 1min mark.
However I want to add this, the noise completely disappears when the gearbox warms up, which is around 20km of low traffic, which just so happens to be my commuting distance
Shifting is fine btw, a bit cluncky but no grinding, no noises during shifting. Also there is zero movement on gearknob on all gears, including 5th and 6th.
one more thing, noise disappears instantly when I put the gear in 5th.
My mechanic is suggesting we change the oil and see what happens first. I'm think of using castrol syntrans 75w 80, I couldnt find any Fuchs oils in Turkey, wrote them an email, didn't even get a reply