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This diagram shows the various paths the cooling system has...

Note that the turbochargers have their own separate cooling path from the engine with "A" being the return path and the hose on top being the supply path. Both of these hoses are near the exhaust manifold and turbocharger exhaust housings, thus the hoses are exposed to significant heat soak conditions. It is highly recommended that these be replaced when turbocharger(s) are re-built.

The Mazda part numbers for the two coolant hoses for the turbos are, N3A1-13-54X0, and N3A1-13-5360.