[crios]

Originally Posted by JFP in PA

And some states do have distinct noise level limits, CA for one comes to mind, so it can enter into the picture at inspection time..........

I just smog’d my car in CA last month, passed.

The sound is not LOUD, it's simply deeper. It's a growl, not a bark.

As for visual inspections, they check if you have done anything to the filter area, not the tail.

You cannot even see anything in my pipes, they are so dark with oil!