Q: Will it noticeably change how the car looks?

It gives the rear a sportier, more finished profile and is wider and longer than the stock Model Y Performance spoiler, so the change is visible without being loud. It reads as a tasteful upgrade rather than a wing. If you want carbon at the rear that looks purposeful and factory-adjacent, this hits that brief. Many owners balance it with the carbon front lip spoiler so the front and rear read as a set, and you can wrap or paint the spoiler to a solid color if you prefer.