The Kartboy Front Shifter Bushings replace the stock shifter mount bushings. While this product will not change the geometry of the shifting mechanism, it eliminates excessive play in the system for a more solid gear change. This simple modification will make your shifter linkage feel 10x more solid. This product requires jacking of the car and jackstands are mandatory. Can be installed in 30 min and are accessible from underneath the car. The Polyurethane material is Grey for the STI.