The top 5 exterior brands enthusiasts actually trust for the FE1 (2022-current) Honda Civic Si — ranked by community reputation and fitment reliability.
2022-2026 Honda Civic Si · Exterior
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Mugen
Honda's official performance division makes purpose-built exterior upgrades (spoilers, side skirts, diffusers) specifically engineered for the FK11 Civic Si with OEM fitment and finish quality.
Sold through authorized Honda dealers and select JDM performance retailers; limited direct availability in North America.
Spoon Sports
Japan-based Honda specialist with a decades-long track record; their FK11 Si exterior pieces (splitters, side skirts) are respected for aggressive styling and precision manufacturing.
Primarily through specialized JDM importers and direct from Japan; availability in North America is limited.
ACS
APR Control System (ACS) produces carbon fiber and composite aero pieces for the FK11 Civic Si with strong fitment reviews and lightweight construction sought by Si owners.
Available through performance retailers and direct; check major online performance shops.
Seibon
Carbon fiber specialist trusted by Civic Si enthusiasts for hoods, trunks, and door panels; known for quality carbon layup and proper fitment on the FK11 generation.
Widely available through major performance retailers like Summit Racing and specialized carbon fiber vendors.
Duraflex
Established polyurethane body kit manufacturer with affordable, bolt-on options for the FK11 Si; widely used in the community for front splitters and side skirt upgrades.
Widely available through major performance retailers and online automotive retailers.
Adds live pricing, recent forum sentiment, and fitment notes from real-time search.
Curious what to expect? Here's a sample report for VA (2015-2021) Subaru WRX.
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