Strange noise at 2,5k rpm

[Matheus]

Well guys, the problem is simple. A whistle, cricket, that only happens between 2500 - 2700 rpm, at second and third gears. At first gear there is no noise.

I do know that that are thousands of threads about everykind of strange noises coming from our cars, but I've never seen anyone who experienced this one.

By the way, it only happens when car is warmed up.

Here is the link for video. It's not so easy to notice in video, but I hope that someone could at least give me some tip about how to find what is it.

Thanks guys.

[///M Power-Belgium]

Sounds like a exhaust rattle noise or somewhere around the manifold...

[Blyy23]

How about higher gear? Is that every 2500-3000RPM, more than half accelerator, then it is show up

[Matheus]

Originally Posted by Blyy23

How about higher gear? Is that every 2500-3000RPM, more than half accelerator, then it is show up

I did some tests and I figured out that it happens in all gears. Always at 2,6k rpm. It happens when decelerating as well. It I keep the car at 2,6k rpm, the noise don't stop. When revving the engine in neutral, there is no noise at all. It happens only with accelerator pressed, like 1/4 or more.
It looks like that some thing is scraping.