Top end knock/tap that increases when the engine is rev'd
2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage. 2000 Pontiac Grand Prix GTP: Twincharged (T67 Turbocharger). 2007 Chevrolet Silverado 3500 Dually: Intake, Exhaust, and Tune.