Oh it's easy to rod out a glass pack. get your self a big Yam, or two if you have a dual pipe setup take a wooden bung hammer and pound the Yam, or Yams into the exhaust pipes. Get in your truck start the engine and red line it in a couple of seconds your glass pack is reamed, along with the rest of the exhaust system when the whole thing blows it self out the back, BA-LOOOOOOM..... RUGGA CHUGGA, blump, barroom...baa-baa-room...room. After this treatment your truck will be heard at least three states over from where you a sitting.

When your friends ask your about your cool new exhaust system you can tell them it is a Popeye special, "I yam what I yam"........sorry