So, today I collected my car from Forge in Gloucester and OMG I feel like a little kid playing need for speed! Its the first time I've owned a car with a BOV and it is so much fun. The turbo noise is accentuated and the noise is loud enough to hear in the cab, but not overbearing. Outside it sound wicked. Here is the YouTube video:
I have a Forge recirc valve on mine with a ktec induction kit. The sound is amazing! I absolutely love driving my Megane. I agree with your need for speed comment!