Custom Dynamics ProBEAST Dual Tone Air Horn Custom Dynamics ProBEAST horns are a direct replacement for the stock cow bell horn. This compact dual tone air horn with an attention making 104.9db, making it much louder than the original MiniBeast. Features: 104.9db rating (at 2 meters) Heavy duty metal bracket and ABS cover Plug and play wire harness included BCM compliant Cover dimensions: 5-7/8 x 5-3/4