Hella H31000001 114dB 12V Sharptone Panther Dual Horn Kit with Perrin Install Bracket for 2008-14 Subaru WRX STI (Yellow) The HELLA Sharp Tone disc horn has a focused and penetrating tone that cuts through traffic and other noises. Sharp penetrating tone, 114 decibels. Frequency low tone: 350 Hz, Frequency high tone: 415 Hz. Robust premium look with distinctive yellow grille. Perrin installation brackets included for 2008-14 Subaru WRX / STI.