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The Monster Trunk System - Cool Only is engineered around the manufacturer's application-specific specifications. Monster Trunk System - Cool Only BIG POWER OUT BACK! The trunk-mounted system delivers more volume than Vintage Air's standard trunk system and is great for larger cars. Molded dual louvers mount to back seat package tray. Switch pod mounts under the dash. May be used as part of a dual air system too.Trunk units will require a custom length refrigerant hose kit.