Sum: It looks like John wants to relieve the air from the bottom of the car with his rendition of the air vents in the bumper area. The tail light removal of a Studie relieved the "fender well" area.
Removal of a Honda tail light would just open up the trunk. However John could consider "air ducts" which are also legal for the class, using the tail light opening for the exit of the duct.
IMO, John is looking for a way to eliminate the "air grabbing" rear bumber the Honda Civic is saddled with from the factory. Since I own the same model he is using I know what is under the car. A "belly pan" designed correctly would be his best bet but unfortunately is not allowed in the class he is now running in. If he did choose to run in Comp Coupe and build that belly pan he is already 50 MPH over that record too. I'm sure John has looked at all this and is planning what's best for their car and the records.
Personally I appauld what he and Sean have done in this H class The use of the modern engines and innovation is fun to watch. They also do not want to be thrown out of impounds or be protested and loose the protest. Once again they are to bee applauded for this...Good Luck.