I'm kinda confused by the whole situation, can you take a pic of how it bolts on to the headers?(you said its welded..not sure what you mean)
+1 i dont understand what you are talking about. By your description, it seems as if you have a big leak at the header--midpipe connection. For some reason, the midpipe was welded at this connection and you cannot get it to seal.
what's been welded up? On your midpipe you should have a somewhat loosely fitting piece of metal (it goes over the header studs) that attaches to the header. Is that welded down?
