I have a 2004 XC70. We recently replaced the Pirelli tires that came with the car with the only slightly larger Yokohama Avid V4s. Since then, we have had two problems. First, at around 65 mph, we get an intermittent vibration. We have had the tires rebalanced but that did not entirely correct the problem. Second, when driving in heavy rain, the car will periodically make this very loud, high-pitched and steady buzzing or humming sound, something like one of the sounds you hear when a fax machine calls your phone. Has anyone had similar problems and know what the cause/solution is? Thanks very much!