Clio RS -> Funny whistling

Hello together… so, now eats so far. I got my little one in Munich yesterday. It’s awesome! The equipment is perfect and the chassis is super hard. The little one drives like a go-kart. No comparison to my 1.6 16V. Well, now the odometer shows 550 km and I couldn’t resist to push into the gas once… So, “Pedal to Metal” and at 4500 rpm the post goes off so much that it’s a real pleasure! GEIL… The sound also fits… ONLY when I he I heard a funny whistle at about 5000 rpm. What is that or what could it be? Is that normal? Greeting Björn PS.: You can find a detailed experience report about the first 2 days on my website.