Probably best to record your engine rather than referring to similar sound of a completely different car and manufacture that's had a cone fitted, any problems when driving or stored codes?
Also what engine do u have? If u have turbo could be referring to this noise
I've just bought an astra club 2009 1.6 petrol and I'm getting this sound, like its sucking. It's also struggling when I press the accelerater passed half way and smelling of petrol when I open the windows. Can anyone help?