Fit For Cummins 6BT 6CT QSB5.9 9111549202 For 4089208 Compressor Cylinder Head 220103. OEM NO. : 4089208. By significantly lowering the temperature of air compressed by the turbocharger, the intercooler increases its density, allowing more oxygen to enter the cylinders for combustion. Its optimized fin and tube structure cuts inlet air temperature efficiently, preventing engine knock and ensuring stable combustion. The durable anti-pressure aluminum alloy shell resists thermal deformation, maintaining consistent heat exchange performance under long-term high loads., Manufacturer: KASDPMNB