2018 WRX STI H4-2.5L F/I Typhoon Performance Intake (KNN69-8009TWR)Gain a guaranteed increase in horsepower and torque with a K&N cold air intake system featuring a mandrel bent aluminum intake tube. Each system is paired with a washable, reusable High Flow Air Filter featuring oiled cotton filter media. The oversized, conical filter design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield or air box helps protect intake air from the high