By changing the rear motor mount on your Focus ST225, you’ll reduce excessive engine movement to ensure easier, quicker gear changes as well as reduce wheel hop. There are 3 different stiffness options available. The Yellow bushes are perfect for an everyday driver. This option offers a near stock driving experience in the NVH (noise, vibration, harshness) department. It is suitable for the occasional track day and is a much better material than the OEM rubber mount. The second, more stiffer option is the purple bushes which is aimed at more track and race style applications. There is an increase in NVH and may not be suitable for everyday use (although it not too bad). This will massively reduce engine movement ensuring faster gear changes. The third option is the black bushes which are near solid. This is aimed at the most hard-core track use and is not recomended for street purposes. This bush offers the most precise and accurate driving experience.