This is an aftermarket set up, the muffler is there in the bottom right in the last picture. It’s just a lot smaller than the original OEM muffler that comes stock. The overall job doesn’t look terrible but also doesn’t look the greatest. Sounds like the major issue is whether it will pass emissions or not. Hopefully they didn’t cut out the catalytic converter. Otherwise as long as your gas mileage is still good than there isn’t anything to worry about. If you don’t like the sound find a mechanic that will install a muffler that is quieter. Let us know your outcome. Good luck.