PIII GR Corolla Airbox IntakePIII GR Corolla Airbox Intake Kit The PIII GR Corolla Airbox Intake Kit is a complete OEM+ intake solution developed to increase airflow, improve induction sound and support higher engine performance while retaining the practicality of the original Toyota panel filter format. After more than 12 months of development and real world testing across multiple vehicles, from Europe imports to North America, we created an airbox that improves the GR Corollas