Using these Voodoo 13 rear toe arms is quite straightforward. First, gather all the tools you need, including the Grade 10.9 zinc - plated hardware that comes with the set. Then, carefully remove the old rear toe arms from your Subaru WRX, STI, BRZ, FR - S, or FT - 86. Next, install the new Voodoo 13 arms in place. You can adjust the toe to the correct specification according to your car's needs. Since these arms use spherical bearings instead of rubber bushings, you might notice a bit more noise and less comfort compared to the original parts, but that's normal for high - performance upgrades. When it comes to maintenance, keep an eye on the QA1 spherical rod ends. Their self - sealing and self - lubricating Nylon/PTFE injection - molded race helps keep out dirt and debris, but it's still a good idea to clean them regularly. Check the Grade 10.9 zinc - plated hardware for any signs of loosening or corrosion. If you see any issues, tighten the bolts or replace the hardware as needed. Also, the MIL - A - 8625 Type III hard anodize finish on the adjusting rod provides good protection, but try to avoid harsh chemicals that could damage it.