the slotted rear bumper is a factory option on the 06se heres a link to a couple of places that carry them.
[url=www.gmpartsdirect.com / [url=http://www.paceperformance.com]
www.paceperformance.com[/url] ]
www.gmpartsdirect.com /
www.paceperformance.com [/URL]
and the part # is 19120590
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2005 grand prix 4door sedan, custom dragon seat covers, green underbody neons,green dragon vynils, soon to have 2.1 million color underbody led kit