Using this GrimmSpeed shift knob is easy. Just screw it onto your Subaru's manual transmission gearstick. Make sure it's tightened well to avoid any rattling. If you have a 2002 - 2014 WRX with a 5 - speed transmission, you'll need to buy the shift boot retainer separately and install it as well. When it comes to maintenance, keep it clean by wiping it with a soft cloth. Avoid using harsh chemicals as they may damage the textured powder - coat finish. With proper care, this shift knob will keep looking great and give you a smooth shifting experience for a long time.