Make player’s own forza aero and share it.
But, there is couple of problem.
1.hit box
2.some are too op
solve:
1. only customisable in limited place on car.
2. aero doesn’t make difference to car’s performance.
It will make forza horizon greater.

(developers, please read down below. 1, 2, 3, 4, 5, 6 ,7th reply is really important. )
Sorry to say it; but the shape of the aero always impacts the performance. Even the slightest changes can have effects.
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Ah, sure, well, but when someone is gone too try-hard it got too op, (make like 5.0G-force)
and it will end up with game rule break 

OR, make difference a bit.
It’s a game. It’s programmed. User aero could easily have zero impact if the devs wanted
3 Likes
I know, but, you know…, I’m a more REALISTIC type. I want more realism.
2 Likes
Me too, than, I’ll make vote here.
1 Like
(developers, please read this)
- Aero parts don’t make any aero-dynamics
- No, aero parts SHOULD have aero-dynamics (have difference by shape)
- For neat and tidy game, make aero-dynamics A BIT. (have difference by shape)