Harley-Davidson’s latest Icons Collection release pays tribute to the legendary 1990 Fat Boy Grey Ghost. But we’re not just here to admire the paint on this motorcycle. We put this special-edition cruiser on the dyno to see how much power it really makes.br br With its Milwaukee-Eight 117 V-twin engine, the Gray Ghost has the muscle to back up its iconic style. Is the Gray Ghost just a showpiece, or does it deliver the kind of performance Fat Boy fans expect? Watch and find out.