aftermarket horns?

FIAMM seems to be popular here.

 

I got the PIAA. The Hella also good

 

dashcam is a better use of your money, horns don't actually do anything.

but if you insist, hella sharptones or an air horn.

 

There's a long thread, link in my signature below. Inexpensive, but definitely worth it upgrade.

 

I have Hella Supertones. Love them!

 

Yeah they do, they might help you avoid getting hit by that inattentive driver that's trying to merge into you without properly checking their blindspot. All the dashcam will do is record the event.