Yep, I'm a little concerned about the torque converter, I've heard/read the factory ones leave a bit to be desired. Good point about the cat, but mine's an empty shell. I rodded it out after it clogged a couple years ago. I need to climb under the truck in the morning and shake the tar out of everything to find the rattle, but as for the buzz?

In order to know what you want, you'll probably have to find out what you don't want.