Using this conversion kit is straightforward. First, you'll need to remove the existing parts from your 4 - door Subaru WRX or STI from 2002 to 2007. Then, cut the original quarter panels to make room for the new ones. Install the front bumper, front wings, and rear quarter panels that come with the kit. Make sure to double - check the fit as you go. Remember, this kit is made to order, so it will take around 2 weeks to arrive. As for maintenance, regularly clean the parts with a mild car cleaner. Avoid using harsh chemicals that could damage the finish. If you notice any loose parts or signs of wear, tighten or replace them as needed.