Many do: the 2015-2021 STI shares its core platform throughout. Engine, drivetrain, and suspension parts usually cross over without issue. Exterior components are the exception, since the 2018 facelift changed several body panels. Always check the fitment info on the listing.

Intake, cat-back exhaust, and a professional tune give you the most noticeable gains for the money and lay a foundation for everything after. If handling is your priority, coilovers or springs plus sway bars come first instead of STI aftermarket parts.

STI aftermarket parts can affect coverage on related components, and most 2015-2021 STIs are outside factory warranty anyway. Check with your dealer if warranty status matters to your build.

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