I don’t know what a ported muffler is. Never heard of that one.
Also, glass packed mufflers are a tasters choice. If you like it, then it is for you. I’d rather never heard that noise from f them by themselves. I’d love to never hear them ever again. IMO, that’s the sound of cheap *** coming! NOT power coming.
For sound enhancement or to help tone down, fine.
Know for sure and do not jump to conclusions because that is “Assume” which can be bad. I am not saying your wrong though because we I do not know! ;)
I just find it hard to think the factory would use a glass pack muffler.
