DUAL Super Tone LOUD Blast 139Db Universal Euro RED ROUND HORNS (Quantity 2) High Tone / Low Tone Twin Horn Kit with Bracket Pair Compact &ndash; Extremely LOUD for Car Bike Motorcycle Truck for BMW 1 3 5 6 7 8 Series M3 M5 M6 303 315 318 320 i 321 325 326 327 328 329 335 340 501 502 503 525 527 535 507 600 700 720 725 735 755 1500 1600 1800 2000 2002 2500 2800 3.0S 3.0Si 3.3Li Csi Honda Acura Civic Fit Prelude Integra RSX Accord LX DX EX Si RSX GSR TSX CL TL GSR LS EK9 EK EG Type-R S JDM other models Universal Fitment / Relay and 2 Mounting Brackets plus Instructional Installation Diagram Included Super Loud - Sound Output: 139DB - 530-680 HZ / 12V Power Source - No External Air Supply Needed Made of Steel and Powder coated in Red Color for a Long Lasting Finish Mounting Type: Single Screw - Terminal Contacts: Blade Type - Includes 2 Universal Mounting Brackets Diameter = 4.89 / 124mm (without mounting bracket), 5.31 / 135mm (with mounting brackets). Depth (Thickness) = 2.65 / 67mm. They can easily be tucked behind Most Vehicles Grills.