This Torque Solution HKS blow-off valve adapter flange with plug is made for Subaru WRX and STI applications as indicated in the description. The flange and plug provide the interface needed to fit an HKS BOV to the specified Subaru turbo plumbing, delivering a vehicle-specific adapter solution for the WRX/STI platforms listed.
Torque Solution HKS BOV Adapter Flange w/ Plug: Subaru WRX / STi