i have the thrush glasspack on my truck as well, i have a 99 sport 5.2. i wanted a little noise so i went cheap and bought the glass pack and cut the stock muffler off at the inlet, slid the glasspack on, clamped it, and then left off the tailpipe. I like the way it sounds. Eventually I want to upgrade to cat-back.

 

How fast does it take for it to burn up.