Using the AMS carbon fiber shift knob is straightforward. Just install it on your 6 - speed manual transmission Subaru WRX or STI as you would with a regular shift knob. When driving, enjoy the easier grip and more precise gear changes it provides. As for maintenance, keep it clean with a soft, dry cloth. Avoid using harsh chemicals that could damage the carbon fiber. Also, remember that because it's a hand - laid motorsports - grade part, there might be some minor imperfections, but that's normal and doesn't affect its performance.