SKI DOO MACH 1 EXHAUST HELP!?

i have a 1991 ski doo mach 1 617cc and i need a new pipe.....does anyone know what model and type of pipe i have ?and if so....where to buy one??...my old pipe is falling apart...PLEASE HELP!SKI DOO MACH 1 EXHAUST HELP!?
You can purchase here...

http://www.busytrade.com/hotkeyword/Ski_鈥?/a>

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