There's a guy selling some in the Parts for Sell section. I think he wants $150 but one of the pipes has been cut.
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yeah i saw that for 150, im talkin to him but im iffy about the cut pipe

 

Or just do what I did almost 2 years ago. Buy 2 Dynomax Racing Bullet Mufflers and have them installed ahead of the axle. Remove your stock mufflers and have those replaced with 2 1/2 inch exhaust pipe and weld any tip that you like. Almost any muffler shop will do this for you at a reasonalble price.