
This listing mentions: F82 · F83 — confirm against your exact build.
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Call it what you want — it's the same part. Younger builders call these PSM skirts, side skirts, M4 skirts and carbon skirts. Old-school guys call them rocker panel extensions, side sill covers and rocker skirts.
"PSM Style" = replica naming, not genuine PSM. Fitment per listing "BMW M4 F82 F83 2014-2019; Car Make FOR BMW M3 M4; Year 2015+" — buyer confirms exact chassis/year/VIN with seller. Weakest evidence of the three kit pieces; the diffuser is the strongest. Verification: product-detail page opened live 2026-09-21. Search it your way — Younger builders call these PSM skirts, side skirts, M4 skirts and carbon skirts. Old-school guys call them rocker panel extensions, side sill covers and rocker skirts.