Below is a Pic of what I did... I kept the Muffler Housing so all State inspections go okay, i cut open the muffler with a four inch grinder, gutted it and welded a straight pipe within the muffler housing
After the straight pipe was welded in i re-welded the muffler housing back together to fool any suspecting authority.
Here is what it sounds like!!!
http://www.youtube.com/watch?v=VhyGKBD1XLI