Upgrade with aFe POWER and feel the difference. Welded-On aFe Power Plate. 2011 Chevrolet Silverado 2500 HD: EngineBaseLiter: 6.6; EngineBaseCylinder: 8; EngineFuelType: DIESEL. 2012 Chevrolet Silverado 2500 HD: EngineBaseLiter: 6.6; EngineBaseCylinder: 8; EngineFuelType: DIESEL.
