There is nothing subtle about the sound of a Maserati Levante V-6 on startup. It is an ideal way to start the day — and startle the unexpecting. The Levante is a precision tool in the working class of superluxury SUVs. Most of the competing brands in this $100,000-plus segment of so-called utility vehicles — Bentley Bentayga, Porsche Cayenne Turbo, Range Rover Sport SVR — begin with a family-oriented SUV that is turned into...