How loud are they? Is it a huge difference?
The instruction show not installing one, so I haven't yet. If the fuse burns in the future I may. The Horn fuse is 10amps and together these say 9 amps.
In the "easy" category , I installed the Stebel HF80/2 dual horn package I purchased from Murph's:
http://www.murphskits.com/catalog/product_info.php?manufacturers_id=45&products_id=356
They come in a nice box, not bubble packed like it shows in his picture, with two straight brackets for each horn.
I just doubled the brackets and installed them with the bolts for the original horn bracket. Leaving the original bracket installed.
No no clearance problems with the fender. I swung the front wheel both directions to ensure no clearance issues with the radiator.
The camera lens is slightly below the top of the fender looking back so it may look tight. But in the back by the Rad where the horns are there is a whole lot of clearance.