This horn is NOT compatible with 2009 Honda Odyssey. First, the instructions tell you to cut off any existing horn connectors that are already connected to your vehicle so you can use your own cheap connection. Second, the horn itself looks like a glorified two-pronged stereo speaker - NOT something you want to see in a car or on the road. Luckily I decided to try this before I cut anything. The existing mounting screw in my car is too big for the included mounting hole. So I couldn't even connect the horn. Luckily my existing one just got water damaged and I was able to revive it by drying it out. But again, I have to say that Revain's "It fits your car" line let me down. When it comes time to replace the horns, I simply compare the model numbers to the current horns. At first I wanted to do it but AMAZON said they don't fit my car. Well, I'll show you.
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