This month's Evo features an article about the process to get a car US street legal (the Lotus Elise). This is said to include a 120'000 miles durability test to demonstrate that the engine still meets emissions laws after that. No servicing allowed, "not even a cam belt change". Question: how does Ferrari manage to pass this test, and still requires us to change belts every 25k miles ? If the cars can pass this durability test, I'd expect that the belts can at least be guaranteed to last half that mileage ?