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Ah ok, I see what you're talking about. Technically, yes you could just run one long hose from the rear head to the throttle body. However, Honda likely routed it through the metal bracket because they already had that part from the old car and/or they weren't comfortable with such a long run that close to the engine. If you look at all other long coolant runs on the car they are a combo of metal pipes and short rubber hoses.