Using this FactionFab brake rotor is easy. Just install it in the rear of your Subaru WRX (2006 - 2007) or Legacy GT (2005 - 2009) according to the vehicle's standard brake installation process. Since it's bi - directional, you don't have to worry about which side it goes on. When driving, you'll notice improved braking right away. As for maintenance, keep an eye on the brake pads and make sure they are in good condition. The e - coating on the rotor provides corrosion resistance, but it's still a good idea to wash your vehicle regularly, especially if you drive in areas with salt on the roads. If you notice any unusual noises or vibrations when braking, it's time to have the rotor and brakes checked by a professional.