The WR Tsukuba Mount kit, aids in Traction at the strip by greatly reducing engine movement and keeping the power to the ground. Mis-Shifts are Commonly caused by radical engine movement, By greatly reducing engine movement you reduce Clutch Failure and Transmission Failure. After installing these WR Engine Mounts you will see improved 1/4 times from faster shifts and quicker engine response, due to the reduction of engine movement. These mounts are about 200% stiffer than your stock units. Comfort and drivability are still retained, since the mounts are not solid. Compared to silicon inserts or solid filled silicon mounts this is the best way to go, you've got the strength of High Density rubber and the longevity of the properties of Rubber over silicon. This kit comes complete and will bolt into your stock mount locations. You will see these mounts on our racecars this season, for they are the best mounts you can find.