The top 5 turbo brands enthusiasts actually trust for the VA (2015-2021) Subaru STI — ranked by community reputation and fitment reliability.
2015-2021 Subaru STI · Turbo
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Garrett
Industry standard for VA STI turbo upgrades; Garrett turbos (especially GTX line) are the most frequently recommended choice on STI forums for reliability and spool characteristics on this generation.
Widely available through major performance retailers and turbo specialists.
IHI
OEM supplier for Subaru turbos; used in factory STI builds and trusted by VA generation owners for direct bolt-in replacements and modest performance gains with proven longevity.
Available through Subaru dealers and specialty turbo suppliers.
Tomei
Japanese tuning house with strong STI heritage; VA owners seeking higher-flow turbos frequently choose Tomei for aggressive turbo upgrades paired with supporting modifications.
Sold through select Japanese import specialists and direct retailers; limited US mainstream distribution.
Turbonetics
Established US turbo manufacturer with VA STI-specific fitment options; well-regarded on enthusiast forums for quality construction and support of bolt-on performance builds.
Widely available through major performance retailers.
BorgWarner
Major OEM and aftermarket supplier; EFR series turbos are increasingly chosen by VA STI owners seeking modern turbo technology with strong reliability records.
Widely available through major performance retailers and turbo specialists.
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