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An external trans cooler is cheap insurance for your automatic during particularly stressful motoring excursions. Like the advertisements say, heat is your transmission's worst enemy; B&M advises that typical operating temps for an automatic trans remain between 150-200 degrees F, with an ideal temp around 175. Since engine coolant temps are often higher than this, particularly on late-model vehicles, the small OE trans cooler in the radiator is barely adequate for high-performance or heavy-duty use. The B&M Supercooler is a complete kit that includes plumbing and mounting hardware in addition to the plate-type cooler.