Perrin Diff Lockdown for 2015-2022 WRX/STi (PSP-SUS-536) Tactrix then the thrust bearing is

then the thrust bearing is replaced with a full circle oversized pad bearing that is steel on steel for the slowest wearing bearing possible

This will not bind and break off in your tow hook hole like cheap aluminum kits

GSC Power-Division CNC turned chromoly valve spring seats for the 4G63 Evo and 1G/2G DSM

this WRX cat-back exhaust mates perfectly with the Mishimoto Subaru WRX Performance Downpipe

and increased airflow efficiency all in one neat package

Perrin Diff Lockdown for 2015-2022 WRX/STi (PSP-SUS-536) Tactrix then the thrust bearing isThe Perrin differential lockdown kit for 2015 2022 WRX and STi models adds drivetrain rigidity and precision to throttle input by reducing movement from the rear diff. Under tough driving conditions, the drivetrain and differential will twist, causing a "squishy" or "spongy" feel. This kit will reduce that movement for a better driving experience. Vehicle Fitment: 2015 2023 Subaru WRX 2015 2021 Subaru STi Installation Guide PDF Purchase Includes: (2)