Jeff,
I got it from gmpartsdirect.com. It was $419 + 100s&h. I thought $100 was a little to high but after seeing that it weights 85lbs I didn't think it was to out of line.
Fred
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2004 GTP/WS6 Sport Red Metallic
3.4" pulley,GMPP cat-back,180 stat,Evo5 rims