>I replaced the muffler on the Syncro last week and found out why the exhaust
>smells like a car twenty years older. What looked like a cat was just an
>empty can. Why is this done, and what effects does it have on tuning,
>performance, etc.?
>   We don't have inspections in this part of Michigan so I'm not worried about
>that. I may put one in so my clean air conscience doesn't bother me though.

Just fill it with Purina...