Using the KEIN Rear X Brace is straightforward. First, gather all the necessary hardware included in the kit. You won't need to drill or cut anything during the installation process. Simply attach the brace to both sides of the center tunnel behind the rear seats as described in the instructions. This will increase the rear chassis stiffness of your 2002 - 2007 Subaru WRX or 2004 - 2007 Subaru STI Sedan. When it comes to maintenance, keep an eye on the powder - coated finish. If you notice any signs of wear, you can touch it up to maintain its durability. The brace has been torture - tested on streets and tracks, but avoid exposing it to extreme conditions for long periods. Remember, this brace can be installed together with KSUB012, but pay attention to the different fastening and tying methods. And don't worry, the rear seats will still fit properly after installation. Also, it comes with a 2 - year warranty, so if you have any issues during this time, you're covered.