Torque Solution Billet Rear Subframe LockdownTorque Solution Billet Aluminum Rear Subframe Lockdown Applications: Subaru WRX STi 2015+ Torque Solution continues to push the limits of high performance aftermarket products with our Billet Aluminum Rear Subframe Lockdown for the Subaru WRX STi 2015+. This system was designed to reduce movement of the rear subframe. This results in improved transmission feedback when shifting, helps eliminate wheel hop and gives the car a more solid feel under hard