Using this BC Racing BR series coilover kit for your Subaru STI is straightforward. First, make sure your vehicle is on a flat and stable surface. You can adjust the ride height according to your preference by using the separately adjustable feature. Just turn the easily accessible adjustment knobs to set the height that suits your driving style and performance needs. For damping adjustment, there are 30 levels to choose from, so you can find the right setting for different driving conditions. When it comes to maintenance, check the coilovers regularly for any signs of damage or wear. Since they are completely rebuildable, if you notice any issues, you can purchase individual parts separately. The patented concave lower locking ring helps keep all adjustments in place, but it's still a good idea to double - check them occasionally. Keep in mind that custom kits take up to 8+ weeks to ship, so plan your purchase accordingly. And if you get the optional rear extenders, you can conveniently change the dampening range without the hassle of removing your rear seat every time.