Lotus Elan S4 AirboxNot only does our airbox have a factory like appearance, it has a neat secret inside! We have engineered short velocity stacks inside the box that clean up and direct airflow into the venturis of the two Stromberg carburettors. The original design had just sharp edges into the carb's mouths, causing turbulence and low velocity areas inside the venturis above the jet bridge. Take a look at the CFD simulation comparison in the images to see the