Glas packed muffler is just a muffler Packed with untreated low quality fibre glass. Very comon and most Canons are built like that.
Look I know my exhuast, but I know less about the Canons, I don't like them, too much But basicly they are all the same, the Jap ones and most local ones come with a restritor in the rear to lower the noise. but it kills performance and makes it worse thne a good striaght through desgin.
See A canon is basicly a pipe with holes in it wrapped in firbre glass or other matterial this is used to dampen the sound then it is wrapped with it's it's container or stainless steel. Most noise basily comes striaght out the rear from the tip.
With a normal sports exhuast or striagh through, it comes into the middle of the Muffler - Right in the middle the pipe could be set of to the left or right but it's opening is in the middle, you have your radiating space, it's like a hollow in the middle there - you have then either side plates with holes in them called baffle plates behind them there is more. Onthe other side to the entrance of where the first pipe comes in you have your exhuast out put pipe where you attach Tip or Tips ETC.
A resonator is just like the canon but some have actual baffles in the middle. Most don't differ much just different numbers of holes and sizes.
Ps
Genie Make headers, mostly for V8-s and very popular 4cyl motors N/A only. Genie Extractors are like the MOTEC Exhausts they are very good.
I think some one was trying to point out Genuine Canon not a fake Canon. Not Genie Canon's Have never seen one not saying dont' make them but never heard of them. Only mostly HKS, APEXI ETC are the Genuine ones.