thats it spot on, driving with care no noise but drive it hard the noise is a bit like a turbo charger kicking in, i notice that if you keep to the limits its ok, mind you its a great sound when pushed, i dont mind this as i am a bit heavy footed my wife keeps on reminding me its only a small engine but for a small car its very nippy and i do like to be a bit of a boy racer......... by the way im 60 years old, and in my youth used to drive a mini cooper (s) and the noise from that with a flat top air intake on the engine you could not have a conversation never mind hear the radio .