Using this product is straightforward. First, make sure your car is on a flat and stable surface. Then, carefully remove the old control arms and toe arms from your Subaru WRX or STI. Install the new rear control arms and adjustable toe arms included in the package. Once installed, you can start adjusting the camber and toe according to your preferences. It's important to double - check all the connections to ensure they are tight. As for maintenance, regularly inspect the powder - coat finish for any signs of damage. If there are chips or scratches, touch them up to prevent rust. Also, check the polyurethane bushings and heavy - duty ball joints for wear and tear every few months. If you notice any issues, it's best to replace the parts promptly to keep your car's suspension in top shape.