2008-2014 Subaru WRX/STI Rear Differential Inserts by Torque Solution Torque Solution Polyurethane bushings are much harder compared to the OEM units. By replacing them with these harder Polyurethane units you can 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, and more predictability on throttle input, along with eliminating annoying clunking during hard shifts. Features 1000HP+ and 8sec e.t. torture tested 75A durometer bushings Limited Lifetime Warranty Benefits Eliminates the \” CLUNK \” when shifting hard Reduces wheel hop/traction loss Improved 60fts / e.t\’s Applications 2008-2014 Subaru WRX/STI What\’s In The Box? 1 – Rear Differential Insert Kit Warranty Torque Solution\’s Standard Limited Lifetime Warranty