Surprised nobody has mentioned this already but there is more than one thread on the horn issue... Search is your friend here. Not sure about the Hella horns but if you care to keep it OEM there is a Toyota plug-in option to help with this. I went with the Toyota option myself but some still find that not throaty enoughm for their taste, but I find it adequate, and definitely x1000 better than what comes with the truck.
Part number in the part # only thread: Horns
Part number in the part # only thread: Horns
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