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High performance carbon fiber spoilers can make a vehicle look like a sports car, adding greater downforce and contributing to aerodynamics, greatly improving styling and appearance.
Click on the link to order: Tesla Model 3 Model Y Spoiler Carbon Fiber Rear Diffuser Body kit
You don't need a wind tunnel with CFD, btw its computational fluid dynamics.
That said, on point all those wings, winglets, foils, lips add drag. Tesla's already spent tons of time tuning the aero on these cars and so generally speaking anything aftermarket you add is gonna have a negative aero effect. But ppl will do it just for the visuals. And then there's racing where appropriate use of downforce is wanted.