CNC machined from forged billet 6061-T6 aluminum. Direct replacement for the OEM horn. With 110 dB output, which is louder than stock. Stainless steel mesh insert matches Arlen Ness Inverted series filters wrapped in stainless steel mesh. Diameter 150mm.. Note: Arlen Ness horns can be style matched to other Arlen Ness components like air cleaners, foot pegs, grips, gas caps, head lamps, etc.

Fits: > 91-21 Big Twin with side mounted horns