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Radiator coolant expansion tanks are perfect for performance 2011+ Mustangs with low-mount radiators. They provide an easier filling location and allow your cooling system to bleed off unwanted trapped air. Most expansion tanks allow the use of any standard size mustang radiator cap and all have been pressure tested to prevent leaking. These 2011+ Mustang GT and GT500 coolant expansion tanks feature aluminum construction for durability and a great under-hood look.