Are these new Magnapack mufflers like the old glass packs that eventually plugged up and needed to be replaced or are these some new design where you just put them on and forget about them?? I had a 12468 on my 2000 but those magnapack mufflers sound excellent(14416)

 

The Maganpack 14416 is not built like the glasspacks of old. The muffler in this link isn't the 14416 but it shows how the Magnaflow are built On the inside