Weird Rattle or Metal noise at around 4000RPM when moving?

[Groves8]

I'm almost at 9000km in my 6MT sport, and I can notice quietly theres a rattle or a metal noise at about 4000rpm when moving, not when reving on it's own. Any idea what I can look for to see what this could be? Sounds to be on my left side in front of me, but honestly it's hard to tell what direction it's from.

Sponsored

 

[bresna]

I hear it too. I assume it's something to do with the turbo spinning up as someone has said that happens around 5000 rpm.