Just a question about the inlet runners (dual length plastic ones) found on the EF. I was told that ideally inlet runners should be short for high revs and long for low revs (please correct me if I am wrong). If this is the case, is there a switch that cuts over from the long runner to the short runner as the revs increase? I noticed that Ford got rid of this design on the EL, anyone know why?
I have noticed that a lot of guys use aftermarket one made of metal without dual runners. Are these heat shielded (like jet hot coating you can get on extractors)? If not, wouldn’t this heat the air as it is running from the filter box to the inlet manifold more than the plastic factory ones?
How easy are these aftermarket ones to hook up to the factory air box? Most of the installs I have seen are connected to a pod filter, I would want to sick to the air box for the time being until I can fabricate some sort of cold air induction.
Thanks for any advice.