The original 911 is famous for its old school air-cooled character. That's great, but what about keeping warm? In a water-cooled car, that comes courtesy of a heater matrix fed by the engine coolant. Happily, that's located and under the dash and well protected from wear, tear and weather. In an air-cooled car? That'll be the heat exchangers built into the exhaust and exposed to the elements. What's more, due to repeated heating and cooling of the air contained within the exchangers, condensation forms and in turn rust eats them from the inside out. Enter Heritage Parts Centre based in West Sussex. Their solution is a range of corrosion-cancelling stainless steel exchangers for 911 models from 1969 right up to 1989 and starting from £390. You can find out more by pointing your browser at heritagepartscentre.com or calling 01273 444044.