Description: MAXIMUM PERFORMANCE Our cold air intake for the 2006-2007 Chevy / GMC Duramax LLY-LBZ 6.6L was engineered to minimize air restriction and flows 50.15% better than stock. This kit comes with a fully enclosed airbox that protects the filter from dirt and keeps out engine heat. NO MORE CHECK ENGINE LIGHTS S&B devotes a huge amount of resources to engineer our intakes that allow your engine to run properly with stock calibration or enhanced tuning. This kit was designed to avoid check engine lights with its properly mapped Mass Air Flow Sensor.