Perrin shifter upgrade combo for the 2015-2017 Subaru WRX (DOES NOT FIT STI). Includes a new Shifter Stop (PSP-INR-018) and a new Solid Shifter Bushing (PSP-INR-016). Both can be installed in about an hour with simple hand tools and are a 'must do' mod for the new WRXs to help with some of the slop found in the cable shifter mechanism.