Hi. I am new to Bimmerfest. Hoping to get some help with a recent problem with my 2011 328i. It has developed a loud interference type sound even when the radio is off. I wouldnt quite descrive it as a buzz, which I've been reading about in other threads; its more like an omnipresent tone. It is constant, and does not come and go. It is going to the dealer in a few days to get checked out, the tech guy has already suggested it may be an issue with the amplifier. I might add that the CD player is also on the fritz, it plays CDS but there is a lot of background noise when it is running. I am outside the warranty timeframe by the way. So a couple of questions. If it is the amplifier, could I just buy an aftermarket one and have it installed, or am I captive to a BMW brand item that would require the dealer to install? I mentioned the out of warrranty issue right? If I were to have an entirely new radio and amp installed by someone other than the dealer, is there a coding issue involved? I sense an expensive fix coming an d want to see what my options might be. Thanks!