DaveCT:

Had my catalytic changed less than 1,000 miles ago (2-years). Now it sounds like a hive of bees (or, worse yet, a "ricer") when I hit 3,000 RPM -- buzzes like crazy in all gears when I hit the magic 3,000 RPM. Noticed on a past maintenance invoice, the "heat shield" was worked on to mitigate a rattle. Any other thoughts on where the "beehive" might be?

Thanks!

Brian16V