I am not convinced that simply improving airflow in an ecu managed car would give noticeable improvement. The ecu would monitor airflow and temperature and change fuel injection to suit? I will look up Graham Bell’s tests he has done. From memory very little, if any bhp increase. If any probably small and at higher revs...
Have to disagree, Cain recently fitted a K&N cone filter to my +4 I don't know if it increased the BHP but it certainly increased the low down punch.
