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My wife got a set from 4 wheel parts. After 6 months one of the two horns stopped sounding so it doesn't sound as good as it used to. Maybe that's why they had such a good sale on them last year.
i got 2 horns off a peterbuilt and one off a mack, mounted underneath the cab floor pointed towards the front and a pull valve that i operate by a handle right in front of the front middle seat