I hate how most aftermarket horns are loud but sound "whiny" instead of authoritative. I think it's an asian market thing.
I spent the cash on these guys and have been very happy with them.
I bought the PIAA Superior bass horns because I wanted something as low note as possible. These are 330Hz and 400Hz and I definitely recommend them!
The tough part was finding a good place to mount them, I ended up making a custom bracket and bolted it to the metal on the side edge of my radiator. I reused the hot wire from the stock horn and grounded the horns directly to the body.
You'll never survive another year driving in Baltimore with a squeaker.
https://www.amazon.com/PIAA-85115-Superior-Bass-Horn/dp/B0060ZB43G
Get yourself a set of the PIAA 85115 horns. They are a lower, louder tone than typical horns and really grab people's attention.
I used this adapter to add this horn. Mounting the second new horn in the engine bay was very difficult but I found a place and it is SO worth it. The stock horn is comical at best!
I haven't installed it yet but the video reviews sound good.
These sound great:
https://www.amazon.com/dp/B0060ZB43G/ref=cm_sw_r_cp_apap_JrNiRvBiue9cA