Fred can step on anyone's toes. That's a given.
After what you did to your muffler.... jeez, just about anyone would have tooled on you--- Fred just went there first.
He is the expert, and I've never heard of anyone cutting their exhaust open to clean it.... hehehe....
I laugh, because it sounds like something I'd have done before I found this site.
Fred meant no harm, he just thought it was funny that you cut open your exhaust----- !
Be careful, Dave, we might nickname you the "Muffler Mangler" and you know how nicknames are--- the more you hate them, the more they 'stick'.