Cut away of a Dyno Max muffler #18381

Yep isnt it great to take things appart and learn a few things in the procces:)
Have seen plenty of that over the years from the cheaper lines of stock replacement mufflers,have cut alot of mufflers open to take a look over the years.I much prefered to cut windows into them after first tapping some on them to find the walls if there where no visible signs of them from the outside.
i believe the 18331 is a Walker Sound FX muffler wish is a very cheap line.
The QuietFlow SS mufflers tended to be a much better line much closer to OE,the whole thing tend to be much more solid,just holding them in your hand you will feel the difference and less restricition,but that might have changed since then:)