I mis understood if you didn't go out through the chrome it is still salvageable. But it means totally gutting the pipes like guitarted said. Made your job harder but if you are careful from here on you can still do it. Only probalem I see is with the mesh and packing out you couls get that tinny sound I have heard some people talk about.

Oh and with the reducer out you will have to put a remaveable baffle in I can tell you where to get to give you some back pressure or you will loose preformance.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!