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The gas tank cover offered by Downforce was modeled after the Mugen fuel tank cover, which sells for approximately $5,000 in Japan. The fuel tank cover was designed to enhance airflow by extending the flat surface underneath the NSX even further to prevent turbulence from building underneath the vehicle. The idea is to have airflow under the car as smooth and fast as possible. Anytime you have drag or turbulence it creates a mini vortex vacuum that will pull the car backwards causing a parasitic loss.