Buick’s only RWD Turbo Reatta test mule, built to test the Buick 3800 turbocharged engine which made 245 horsepower. It was unfortunately destroyed after testing was completed. 10 months ago Share this:Pocket Click to share on Reddit (Opens in new window) Reddit Share on TumblrPost Click to email a link to a friend (Opens in new window) Email 2014 Bentley Flying Spur facelift test muleIn relation toWeird WheelsMercedes-Benz O’305 GG O-Bahn BusIn relation toWeird WheelsThe Maybach Exelero is a one-off, high-performance luxury sports coupe built in 2004 to test tires for Fulda. It features a 5.9L twin-turbo V12 engine producing 691 horsepower, with a top speed of 218 mph.In relation toWeird Wheels