To be clear, if you are buying this for a car you will not need an additional wire or harness. A car or truck has enough power to plug directly into the existing wiring. It supports single or two wire installations. The horn comes with a relay. If you are buying for a motorcycle you will need a wiring harness not a relay as it comes with the horn. I bought it for my Jeep, I already have two horns in JK but this one is louder. It was a close landing.
π’ Powerful FIAMM 7201622 OEM Dual Horn Assembly for GM/Chrysler/Ford - Superior Sound and Performance
9 Review
XtremeVision AC 55W HID Xenon Premium Slim Ballast - Get A Pair Of 2 PCS Now!
18 Review
π FIAMM 72102 Enhanced Freeway Blaster HIGH Note Horn
9 Review
π FARBIN 12V Mini Air Horn, Loud Car Horn with Chrome Zinc Dual Trumpet, Compressor Wire Harness and Button for Trucks, Cars, SUVs, RVs, Motorcycles, Off Road - Mini Version with Button
9 Review
Nokian Tires Hakka Green 3 205/55 R16 94H summer
37 Review
Nokian Tires Nordman RS2 SUV 225/60 R18 104R winter
32 Review
Yokohama Ice Guard IG50 215/50 R17 99Q winter
36 Review
Get Ultimate Towing Stability With CURT TruTrack Weight Distribution Hitch & Sway Control - Up To 10K Capacity, 2-Inch Shank & 2-5/16-Inch Ball - In Sleek Black Design
30 Review