It crossed my mind when I was removing the bumperettes that a 1"-11/2"round steel tube bumper might be easily made and bolt up if one were wanting to keep the bumper shocks and some protection while opening up the area for air flow. A hole saw in the aluminum bumper might be easier.
I made a panel to cover the bumperettes hole. Was also thinking about opening up the panel but have recently received a new louver tool at work and another on the way that will allow venting without exposing the inside view. If I ever get around to it...
Enjoying the thread