I bought both treble and bass and installed them as a pair to replace the factory horns. Installation only took about 20 minutes. I just disconnected the wiring harness and removed the old horn bracket. I bought a wiring harness adapter so I didn't have to make any permanent changes and everything was plug and play. I screwed the new horns to the brackets and put them back in place. They are definitely louder and more assertive than the factory horns on my car. I also made a volume change. A screw is glued to the back of the horn. Simply remove the adhesive and turn the Phillips screw counter-clockwise 1/4 turn. Do this at your own risk, but I've had very good results. The sound of the horn attracts more attention than it is annoying, even a brief tap gives a strictly attention-grabbing signal. Kit includes wiring, bracket, ground wire and instructions. Made in the USA. The build quality feels great.
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