Corp. expects a loyal following, but not necessarily mass appeal for its new Pontiac Aztek, a crossover "sports activity vehicle" that debuts this summer. Sales predictions are 50,000 to 70,000 units a year, says Mark Reuss, vehicle line executive. That's not a huge amount by GM standards, but enough to make a bold statement that Pontiac is in the crossover game. The Aztek, which sits on a modified version of the Montana minivan platform, also shares that vehicle's 3.4L V-6. Front-wheel-drive Azteks hit the market in June. The vehicle will base at $21,195, with the GT version starting at $24,995. An all-wheel-drive rendition is due out in January.