The MagnaFlow 21-822 is a direct-fit replacement catalytic converter from the brand's OEM Grade line, sized to replace the factory unit on the 2.0L turbocharged H4 in the Subaru WRX. It is listed as a Federal / EPA Compliant Direct-Fit Catalytic Converter, so it is a legal emissions-compliant swap for a worn or failed stock unit. A direct-fit unit mounts where the original sat, which spares you the custom pipe fabrication a universal converter would demand, and that fit-to-factory approach is the main reason to pay more for it. Search terms this part matches include 21-822 WRX catalytic converter, EPA compliant WRX 2.0L cat, and WRX H4 direct-fit converter.
Fitment is the detail to confirm before ordering. The manufacturer's Subaru WRX listing shows it for the 2015-2021 Subaru WRX 2.0L and the 2014-2018 Subaru Forester 2.0L. The product title in this listing reads 15-19, so model-year details vary between sources. Check your VIN against the manufacturer's application guide. The manufacturer also lists a different direct-fit WRX converter, 21-232, as not fitting 2015-2016 models, so do not assume one part number covers every year. Because the converter is a front-section exhaust component, have the factory part number ready to compare against the new unit before you start the job.
The manufacturer lists the 21-822 for the 2015-2021 Subaru WRX 2.0L, while the product title in this listing says 2015-2019. Because the sources differ, confirm your exact model year and VIN with the manufacturer before ordering.
The manufacturer describes the 21-822 as a Federal / EPA Compliant direct-fit converter. If you live in a state with stricter emissions rules, confirm with the manufacturer that the part is approved for your registration state before installing it.
