I can't imagine any negatives from that air panel being in place over the stock setup.I'm looking to start working on some aero on my 93 Fox body. I am looking at this cowl block off panel and am wondering if it will cause issues later when I add a hood vent, rear wing and front splitter. I know the lower windshield is a trouble area for turbulence if I remember correctly. Currently I have the stock cowl vent on the car. What is the thoughts for adding this panel whether it be now, before I have any of the others or later after I have some?
Also while I am asking question. I have a 93 Notchback. What is the proper height and width I should look at for the rear wing? I thought I had heard before that most wings should be no taller than the roof. I am going to be running NASA TT & ST in the future and rules state it can be no taller than 8.0" above the roof line or width greater than the vehicles body width, or end plates with area greater than 144 square inches each, or 12.0" protrusion from the rear of the vehicle.
In regards to the Wing, AJ just posted a video discussing height and setback on his Youtube Channel. The general consensus is that there's generally no need to mount the wing as high as the roof unless you're dealign with a short decklid like your notchback. In that scenario, the harsh drop off can make it hard to get clean air anywhere near the actual decklid. In your scenario mounting it approximately as high as the roof or just a little below would probably be best.