Has anyone installed speakers on their concours? I've seen a couple pics of concours with speakers but I have no first hand experience. I normally listen to my headphones but - 1) I have a large whole in the dash from the PO (it has a cover but none the less), and 2) It'd be nice not to have fight with the ear plugs. Is the sound half decent at speed? I travel about a 100km a day at highway speeds. Looking forward to your response. Colin