Appears I will have to RTFM then, lol I initially used the lid without the Sena and found it whistley from the first journey home even compared to the cheap shite I went down there in, it was quite disappointing to be honest, but I have lived with it as I knew it was a good lid and besides I had spent all that money and wasn't going to spend it all over again for the sake of a bit of wind, so to speak
