Step 1: UPGRADE YOUR DINKY SINGLE TONE HORN!!! Find yourself a bracket from an '01ish Ranger with dual horns and install some Fiamm high tone and low tone horns. That's a HUGE improvement over the stock '08ish horn. Heck, stock for my '01 dual done, the Fiamm is a HUGE improvement over stock. Good $20ish upgrade.
Step 2: Want more for a regular horn? INSTALL CADDY 4-tone HORNS!!! Sounds just like a train. It's sick sounding for a regular horn.
Step 3: Want more for an aux horn?? Two words: Nathan P3.
That is all...carry on...