Can I vent my bypass to the atmosphere or do I have to recirculate the air?
Cars with mass air flow(maf) meters must recirculate the air. Any air taken into the system is metered and measured. This measured air must be used or the car will not run properly. Cars with map sensors or carburetors can sump the air to the atmosphere. Map sensors do not measure the air until after it enters the engine. The maf systems measure it before the blower just after the filter.
