Universal Air Filter Cold Closed Intake Systems CIS 70 mmThe Apollo's outer shell is made of a durable lightweight material that helps keep incoming air cool as it enters the engine chamber. 's Apollo system includes a cold air hose with a specially designed radius end cap so cooler outside air can be directed into the engine. The Apollo has a 70mm base flange. It is supplied with a pack of vent adaptors to incorporate most engine breathers and temperature sensors from the original air box assembly back