I had the same problem with my turanzas. I have 36,000 miles on my '04 and the pitted tire noise was so bad, i couldn't handle it anymore. I put on some goodyear regatta 2 and problem solved.Yea, sounds like symptoms of the Turanza tires. They're rubbish. My mom's 325i sport has B-stone Potenzas that make terrible noise just like yours, at the same speed range. I don't know why BMW has an endorsement deal with Bridgestone outside of F1. The Pirelli Scorpion STRs are far better tires and make much less noise, and wear better.