Originally Posted by happytheman

I performed a search and was not immediately able to discern what the diff between open and closed o design was.

I have the Nismo Titanium knob installed. Nice knob if you tend to shift like you're gripping a joystick.

Check the DIY section for details on removing the stock knob. It's a bit of a PIA due to the loctite that Nissan used on the threads.