Using your GrimmSpeed Stubby Shift Knob is easy. Just screw it onto your manual Subaru's shifter with the M12x1.25 thread pitch. If you have a 5 - speed model, don't forget to install the shift boot retainer. When it comes to driving, the stainless steel knob with its 600g weight will give you an aggressive feel, helping you shift gears faster and more smoothly. The Delrin knob, weighing 105g, offers a more OEM - like feel. As for maintenance, clean your shift knob regularly with a soft cloth. For the stainless steel one, you can use a mild stainless - steel cleaner to keep it shiny. The Delrin knob can be wiped clean with a damp cloth. Be careful not to use harsh chemicals that could damage the laser - etched logo around the base. Enjoy your upgraded driving experience with the GrimmSpeed Stubby Shift Knob!