Found this today... Im not pleased...***New PA Law***

Thank god my car is registered to West Virginia...we have very few laws (no emissions for example). My list of states I don't want to live in are now PA, CA, and VA. All three of those are bitches about modifications.

If they started pullin that B.S. in WV, I would move to a different state before I would give in.
 
I was curious about the bill, and found the entire contents of it on the PA Legislature website:

http://www.legis.state.pa.us/WU01/LI/BI/BT/2005/0/HB1330P1588.HTM

Perhaps this is an amended version, but it says nothing about forcing you to keep stock exhaust. It specifically says headers and side exhaust is allowed as long as the dB max isn't exceeded. You can't have cut-outs, though.

It reads as a basic "quiet exhaust" law.