http://www.ebay.com/itm/97-02-Grand-...17438b&vxp=mtr
this is about as cheap as they get, you may find free shipping if you look around a bit more. you even get a new res. re use your tips off the mufflers on the car now. buy some clamps, and a cat to res gasket local and 2 new bolts to bolt the res to the cat.
buy some new hangers if need be too, the two round ones for near the cat hangers, and then check out the 2 in the rear, the 4 that hold the mufflers up should be ok.