Using this ABW Motorsport conversion kit is a great way to customize your Subaru WRX or STI. First, start by removing the original parts from your 4 - door car. Then, carefully fit the front bumper, front wings, and rear quarter panels included in the kit. Remember, you'll have to cut the original quarter panels to make the new parts fit properly. It might be a good idea to have some basic tools and a little mechanical knowledge handy. As for maintenance, keep the parts clean by washing them regularly with a mild car cleaner. Avoid using harsh chemicals that could damage the finish. Also, check the fittings periodically to make sure everything is still secure. If you notice any loose parts, tighten them up right away to keep your car looking and performing its best.