I say look for some spintech or dynomax clips.. Thats where I'm heading. Flows are too deep and not raspy enough for my liking. I can't decide between the previous 2 though.

 

Generally speaking, I hate glasspacks. I don't even like Flowmaster 40's, at least on cat-less cars. They're both obnoxiously loud, and glasspacks have a tendancy to pop while decelerating and blow out the packing. And honestly, most people don't have the engine to back up the sound.

I usually prefer Magnaflows or Flowmaster 50's. They're more tolerable and less raspy, more of a growl than a blat.

For my car, I went with Flowmaster Hushpower II's. They're absolutely friggin awesome Mellow 50's tone at idle, good tone while cruising, and they absolutely roar at WOT, especially above 4k rpm. They're expensive though, so not for everyone.

 

Honestly I would go with flowmaster single chambers. That's what I am putting on my 68 and I used to have them on my 2005. Check out my exhaust videos. http://www.youtube.com/f0rdman