My low horn died and I replaced it with a Fiamm Tipo CTP that came from a 70's BMW motorcycle - paid $15 on eBay. I think pretty much any similar-looking Fiamm would be fine. It was broken when I got the car so I don't know what it's supposed to sound like but this one sounds quite, um, European.
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 .