My 2000 Accord has a rythmic thumping that increases when with speed and with turning, much worse on a right turn. Tires are good, tire pressure is good. It seems to come from the left front. I'm told the CV joints are ok, that it was from scalloped tires from alignment problems. So I've had a 4 wheel alignment and replaced all 4 tires with 'new' used tires. Swaping the left front and rear does nothing for the problem. Any suggestions on where to go from here? Thanks.