cat converter

So I've had my Corolla about a year. It's a '99 LE, with 70k on the odo, well.. now about to be 80. And since the day I got it it goes blurrbrbrbrbr when I start it, and when I rev it in a low gear. I've done simple body work, filter swapping, etc. But I feel this isn't something I can do at...

I bought a 2009 Toyota Corolla S from Carmax about 4 months ago. It's got about 83,000 miles on it now and just started making a bad metal vibration sound when I accelerate. I thought it could be the heat shield but two separate mechanics, including a Toyota dealership, have told me that the cat...