The kafer bar ties the top rear shock mounts to the frame horns. This triangulates the area and helps prevent wheel hop (which breaks transaxles) under hard acceleration or "dragrace starts". It's beneficial if you drive hard.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .