For a lower frequency horn (deeper sound), consider the aftermarket 430Hz.
This is the newer model horn that is without capacitor. It relies on the newer moulded horn connector that was developed January 2023 as described by Michael Sha - that connector has the active components inside the moulded connector to drive this 12 volt horn. The moulded horn connector negates need for external capacitors to be exposed on the horn terminals, which is a more resilient design than the older, somewhat troublesome exposed arrangement. You only want one capacitor - the one within within this product (newer, moulded) or the older external one (with non-moulded connector) as shown below.
Image below shows the older, external capacitor soldered to horn.
Suits NUTT A5-D 2-piston calliper on early NAMI Burn-e, MUKUTA 10+, Limited models of Zero 10X/11X, Dragon Hunter X11, early Dragon Cyclone Pro & early VSETT and 4-piston callipers NUTT Y-5 & TurboBrake HB427-4M.
81mm width at bead, 50PSI, green / blue line, suits 6.5" rims of NAMI Burn-e, Wolf Warrior 11>, Dragon Hurricane, Predator 6.5" rear, Zero 11X & VSETT 11+.
81mm width at bead, 50PSI, with self-healing liner, green / blue line, suits 6.5" rims of NAMI Burn-e, Wolf Warrior 11>, Dragon Hurricane & Predator 6.5" rear.