Rotate the tires front to rear. At this time also check the tread wear pattern. If it gets quieter and/or the front tires are wearing unevenly your alignment might be off.
since I bought mine used with 13k miles they said the tire weren't rotated enough...so I guess I live with or buy new 1's..any thought on putting in more insulation like Dynamat or undercoating????
If there is sufficient tread you might be able to find a place to shave the tires a bit to true them up. Then get a good alignment to get a fresh start so to speak. On our MZ5 the majority of the noise is wind noise from the front pillars and road noise after the second row.