https://www.autoblog.com/2019/01/14/subaru-wrx-sti-s209-more-horsepower-detroit-auto-show/
With the Subaru WRX STI S209, "S" finally comes to the United States. Subaru Tecnica International created the S201 in 2000, but this ninth take on the theme — inspired by the class-winning WRX STI Nürburgring Challenge racer — is the first to make it our way. Unlike the last special edition we got here, the Type RA, this one comes with a notable power boost: 341 horsepower instead of the 310 ponies in the regular WRX STI. The muscle comes courtesy of a larger compressor and turbine in the HKS turbocharger, and 1.8 pounds more boost pressure.