The world’s first side by side type intercooler performance improvement structure ‘Dual Air Duct’ is developed by air flow control optimization concept, which is a reasonable and affordable method. The dual air duct increases the flow speed toward the intercooler by enlarging the effective area exposed to the incoming air stream. By adding the dual air duct, the intake air temperature could be reduced up to 7 K, and it contributes significantly to achieve the high-speed performance and fuel efficiency targets.