Using this shift knob is easy. Just install it on your 2002 - 2021 6 - speed Subaru WRX or 2004 - 2021 6 - speed Subaru STI. When shifting gears, you'll notice the added momentum for a smoother and more positive feel. Make sure it's compatible with your vehicle's OEM or Boomba Racing Short Shift lever before installation. For maintenance, simply wipe it with a soft cloth regularly. Avoid using harsh chemicals as they might damage the delrin shell. This shift knob retains reverse lock - out functionality, so use it as you would with a regular shift knob. Enjoy the improved driving experience this shift knob brings to your Subaru's interior.