First of all, let me give you a little introduction of the recent history of my car. When I went to see it, I noticed a noise that I didn't think was normal, but the car was running very well. Another day I took it to the dealer to make a general check-up and an engine compression test. The mechanic said the compression was fine, the spark plugs were healthy too and didn't find any strange noise. I ended up buying the car. Days later, I had to go visit a mechanic and asked for a second opinion about the noise. He said there was a noise from the accessories belt/pulley but not always and advise me to keep going for a while and replace the part later, when the noise gets more obvious. But I think the noise he was talking about it's not the same I told him. When I heard this noise more clearly was when I was accelerating, going up a road in 3rd gear at 1500 rpm. Unfortunately I was not recording, but when I arrived at home, I asked for someone to put the engine at 1500rpm while I went around the car and looked in the engine bay for the noise but it didn't appear that time. The car was standing still, though. I suspected it had something to do with the exhaust system and knowing that the exhaust manifold can crack, I had to inspect it as well as I possibly could but didn't find cracks. One more information, I notice that when I start the car, there's a petrol smell for a moment. For your judgement, I took photos from the manifold pipes junction and made a video of the car running, cold started. https://hubic.com/home/pub/?ruid=aH...wMjA1OGEmdGVtcF91cmxfZXhwaXJlcz0xNDk0MDIyOTIz Had to storage in hubic because it's just sound file. Sorry.