Mercedes 300SL Gullwing at Bonneville Gives Us Salt Fever. There are many ways to enjoy your toys, from driving, to racing, to keeping them in a collection, there are various avenues to gaining pleasure from what you own. For Bob Sirna, this comes from racing at the salt flats of Bonneville. Many different types of cars run at Bonneville, but Bob chooses a car that you wouldn’t ever expect to be racing, let alone down a strip of metal-eating salt: a Mercedes-Benz 300SL Gullwing. Now fetching over a million dollars, the 300SL is a car that you mainly see at a concourse or in a museum—not trying to break land speed records at Speed Week. For the last 12 years Bob has been bringing his Gullwing to the salt in an effort to break records and cure his “salt fever.” Bob likes to say, “Enjoy your toys,” and this is a motto we can stand behind.