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It could be the exhaust rattling against the tunnel brace. I had that issue for a bit when I switched from the 2.25" stock V6 exhaust piping to a 2.5" setup (diameter of stock SS exhaust).
I used to get this weird rattle that sounded like it came from my center console during the high-idle at startup. I later discovered that it was coming from the rear-view mirror. I still haven't replaced the dang thing, I just keep the little headlight switch in the back flipped up so the mounting is tighter.
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Performance Mods: Injen Powerflow CAI, Doug Thorley Cat-Back Exhaust, Doug Thorley Shorty Headers, Trifecta Tune, TSW Nurburgring Wheels 20x9, 3.45 Ratio LSD Swap, VMax Black Ice-Olator
Appearance Mods: RiderGraphix LS7 Front Fascia Blackout Vinyl, Gill Insert Vinyl, Rear Deck Lid Vinyl (Gloss Black), Gary's Customs Painted Bowties
Coming Soon: BMR Trailing Arms
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