Q: Does running cooler oil actually matter on the street, or only on track?

Heat is the enemy of any drive unit, and this cooler adds roughly 10% more fluid volume plus better thermal characteristics than the filter it replaces, so it helps in both worlds. On track the benefit is obvious under sustained load, the kind you put down at a TeslaCorsa track day. On the street it buys thermal margin and cleaner oil for longevity. It was tested at Pikes Peak International Hillclimb, Laguna Seca, and Buttonwillow, so the durability is proven.