Without the "box" you will get better airflow. Somebody actually measured it but I'm too lazy to find their post. However, that box also prevents a lot of debris from clogging up your fans and PEM. You might be better off to keep it.no prob Henry... I meanwhile consider taking the box out which is build around the fans since I drive mine only in good weahter conditions and I once drove it a few meters without the down plate and cooling was amazingly better probably due to a better air flow to the fans