Just curious, do you go into Burger King and ask around where you can get a cheaper hamburger?
Dump the one in muffler, or stick it on ebay and try and recoup some of your costs and put them toward a set of SSI early style heat exchangers. If you don't want heat, there are a couple header options out there, but nothing that will work with a 1 in muffler. If you hit the swap meets, you may find a servicable set of early factory HE's.
There is some more info here:
http://forums.pelicanparts.com/showthread.php?threadid=75664
Tom