NASHVILLE, Tennessee ? The 2018 Alfa Romeo Stelvio plans to join a tough street gang ? there are some accomplished members like the Audi Q5, Mercedes-Benz GLC, BMW X3, and a newcomer with a year?s jump on the Stelvio, the Jaguar F-Pace. Those are the midsized premium sport-utility vehicles that Pieter Hogeveen, director of Alfa