The three-wheeled Polaris Slingshot is a curious car. Mostly because it is, at least legally, not a car: depending on individual states, it is generally classified as a motorcycle or as an ...

The Polaris ... Slingshot SLR, R, and Roush Edition have a 203-horsepower version of the ProStar four-cylinder engine. The Slingshot R, in particular, could rocket from zero to 60 mph in 4.9 ...