Torque Solution Upper Differential Mount Inserts Praying Man stock image. Image of young, background, teenagers 8730273. Torque Solution Billet Urethane Upper Differential Mount Inserts Applications: Subaru WRX STi 2015+ Torque Solution Billet Polyurethane bushings are much harder compared to the OEM units. By replacing them with these harder Polyurethane units you are able to get rid of the unwanted slop and flexing of the stock units which allows for the power to go into rotating the tires, instead of flexing the rubber. Giving you better feedback, sharper response, more predictability on throttle input, along with eliminating annoying clunking during hard shifts. Eliminates the " CLUNK " when shifting hard Reduces wheel hop traction loss Improved 60fts e. t's 75A durometer bushings Limited Lifetime Warranty Fits: Subaru WRX 2015+ Subaru STi 2015+