If you can manage to hook decently off the line you should be looking at mid 14's to low 15's. Although I did witness a totally stock '98 GTP in street trim pull off a 14.2 at Rockingham Speedway a while ago. Factory freaks do exist...
Good luck,
Marc
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'00 Trans Am WS6 w/ 25K miles - Lovin' it!!
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RIP '99 GTP w/ 41K miles - Totaled in fire
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RIP '97 GTP w/ 192K miles - Totaled when broadsided