Well, I got them out. They're basically "glass packs" that are about 6 inches long. I just had to do a heck of a lot of pulling to get them out. They're simply shoved into a hole that's about the same size (tight fit). The steel plate with the 3 rivets is all that was holding it all together (other than carbon). I'm going to try to make my own glass pack that will flow much more than the stock ones do. It should sound about the same as stock (maybe a
little deeper) but offer less restriction. The picture with the red, yellow and blue circles shows how the tail baffle works. The red circle is the exhaust coming from the front of the muffler. The blue one is where the exhaust is reflected back into the chamber behind it, and the yellow circle is where the inserts fit, ultimately leading to the exit of the muffler system.
I'll probably run them only for a short while, though, because I love the sound!
I'll try to get a recording, but all I have is my camera/video phone (I'll have to figure out how to keep the sound from over driving the microphone). It's not
nearly as loud as open headers, but obviously louder than stock. It doesn't have any "buzz" to it at high revs, and has kind of a resonating deep tone to it. Hopefully I'll be able to get a decent recording.
The performance seems to be up all the way around, though I recently side-gapped my spark plugs; the combination of the two is probably where the performance is coming from. I'll see how where gas mileage goes after I run a tank through it.
Edit: If you're careful you could grind the rivets off of the back plate and twist the rear baffle out without damaging anything. If you don't like the sound you could simply put it back in and rive it all back together. Just be sure to twist and try not to bend up the plate up like I did. It's not screwed in, just takes quite a bit of pulling/twisting to loose the carbon deposits.
