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Sounds to me like it could be two different things:
1) If you have the GFX kit it could be your tail pipe making contact with the chrome in the rear diffuser... I had that happened and it sounded horrendous and only happened at low RPM's
2) I've heard stories of a nut from the spoiler vibrating loose and getting stuck inside the trunk. That should be pretty easy to diagnose, just open the trunk and shake it a bit to see if that's what it is.
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2010 IBM 2SS/RS - T BRUTAL
Matte Black Bumblebee Stripes - Unpainted Heritage Grille - Blacked Out Bowties - Stainless Works S-Tube Catback - CAI, Inc. Cold Air Intake
Whiteline Rear Cradle, Rear Differential, Front Radius Rod Bushings - BC Racing BR Coilovers - Installed by Whiteside Customs
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