^^^ first verify my guess is correct. you should be able to see the port blocked off on your exhaust manifold too. I’m not familiar with the v10 at all, but I have made a block off plate for a similar generation crown vic that looked just like that.
then call 5 star and ask if it would make a difference in the tune you got from them. they have a good tech line.
"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."