Porsche (POAHY 0.77%) unveiled a new compact luxury SUV at the Los Angeles Auto show this week. The Macan is a smaller alternative to the Porsche's best-selling Cayenne SUV. As our Motor Money team of Rex Moore and John Rosevear explains in this video, the Macan could eventually surpass the Cayenne in sales, and is hugely important to Porsche-owner Volkswagen (VWAGY 0.57%).