I've had a couple of close calls with blind drivers recently so got a new horn delivered from Nippy Normans during the week.
It took me all of 5 minutes to swap it over (and that's only because i dropped the nut into my bashplate and had to go and find another one!).
They weren't kidding when they say it's 10x louder!! The next car that pulls out in front of me is going to regret it!!
I have some before and after video taken with my iPhone, happy to share if someone tells me how to attach it to the post.
Here's the link to the horn;
http://www.nippynormans.com/products...ectors-stb-zzz
I'd recommend it to anyone!