Torque Solution Rear Subframe Bushings | 2015-2021 Subaru WRX/STI (TS-SU-605S)15+ WRX STI Rear Subframe Bushings by Torque Solution torque Solution continues to push the limits of high performance aftermarket products with our "NEW" Rear Subframe Lockdown System. This system was designed to reduce movement of the rear subframe. This helps to improve transmission feedback when shifting, and gives the car a more solid feel under hard acceleration. Developed to perform under the most extreme conditions, our Urethane Components