I am done debating this, but I will tell you that they do in fact have a effect. Just because you don't see a adjustment or a number change doesn't mean it is purely cosmetic. There is a difference in feel, maybe you don't feel it, but others do.
And by the way, they can't be adjusted because they are fixed.
That's fine, but something as vague and subjective as 'feel' doesn't help anyone like testing and lap times would.
Regardless of the track and choice of controller (though wheels can be more consistant), with an
honest effort against your ghost, a car with the splitter, canards, and diffuser (without a wing) will put down the same lap times as it would without them. Likewise, that car with the splitter, canards, and diffuser (with a wing) will put down the same lap times as it would with only the wing.
Once you put a wing onto the car, even fixed front aero numbers have a value assigned to them (Aventador, R35, 458, McLaren F1, etc.). Add or remove a splitter, canards, and / or diffuser, and there's no change in the numbers. There's no change in the lap times.
I didn't want to believe the placebo effect. Aero parts ahould do aero stuff. That's what they do for crying out loud. But I've put down laps against my ghosts until I was blue in the face. Everything -- braking, turn-in, cornering and top speeds, etc. -- is the
same. There's no additional aero drag or grip. But they look cool.
Somewhere in the annals of GTP is a buried thread about this very same thing with similar conclusions.
