The BMW M1 is a rare and valuable car, and BMW's art cars are even more rare. When it comes to M1 art cars, only two exist. One was painted by Andy Warhol, and remains in BMW's private collection. The other, painted by Frank Stella, has been in the hands of the Guggenheim Museum in New York since 1999. The Guggenheim is now selling this, the only M1 art car on the market, to raise money for new acquisitions. Don't miss the opportunity.