Using the Tomioka 1000 WHP Rear Axles is straightforward. First, make sure your vehicle is a Subaru STI from 2005 - 2007. When installing, ensure that all the parts are properly aligned and tightened according to the standard procedures. During use, be aware that these axles are designed for high - performance racing, so avoid overloading or using them in extremely harsh non - racing conditions. For maintenance, regularly check the axles for any signs of wear, like unusual noises or vibrations. You can also have them inspected by a professional mechanic at least once a year or after every few major racing events. Keep the axles clean and lubricated to ensure their long - term performance and durability.