Does an air filter help to reduce turbulence around the carb top (by "straightening" the flow)? Afaik too much turbulence will screw up the air metering in the carb which can be the case when using a carb hat (especially at higher rpms). I also heard that it's very important to have a plenum on top of the carb (I assume to slow down the incoming air and therefore reduce turbulence).

Background to my question is if I use a cold air intake with a remote air filter should I use an air cleaner housing with a plenum or just a carb hat. Or am I better of to make a cold air intake with the filter around the carb?

Thanks