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ohh I wanted the havoc so badly too but refuse to give up the npp. it sounds perfect with hi flows and fully open!
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2013 2SS IOM LS3
Performance: NPP Exhaust, Solo Performance Hi-Flow Cats, k&n Air Intake, Doug Thorley Shorty Headers
Cosmetic: Diablo Angel Staggered 22", 3D Carbon Fenders (need to install) Eagle Eyes HIDs, Fog Light HIDs
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