See them on the roads up here...must be fun to clean in bug season....the fronts just as complicated.
& the three exhaust pipes..
the centre is a resonator here:-
Civic Type R Middle Exhaust - Why the Civic Type R Has Three Tailpipes (roadandtrack.com)
The F40 centre one is for the turbo wastegate..not the blow off valve..
It is possible that the little wing decreases wind noise from the shell on back.You laugh but with that spoiler it's at .29cd and 500 lbs of downforce at 140mph.