V8 Engine Tech (L76/LS3)
So first off, my car: 2009 G8 GT, 35,000 miles, and daily driven 70 miles a day round trip to work, 90% freeway. Full OBX exhaust from 1 7/8 long tube headers, to the factory GT mufflers, no cats. Used stock GTO intake tube for free flow, factory air box, K&N filter. Wideband O2 to tune with HP...