[jcp123]

My Dad had Magnaflows on his Mach 1. The packing inside was supposed to have been some steel and ceramic materials, supposedly much more durable than regular 'packs. The principle is the same, though, hence the crackly glass pack quality their sound has. He only had that car for a year or so, so I can't really speak to their durability.

I have regular glass packs on my Mustang. She was my DD for a couple of years. They didn't seem to burn out all that much. They're longish, 24" I think, maybe 30". They're still quite mellow.