well the 173 hp number that Polaris shows in the specs is the same as what is shown in the specs for the various solstices and sky's that use the same motor - this makes me suspect that Polaris has never even put the slingshot on a dyno. I suspect they just report generic numbers as provided by GM.
if they actually reported their own specs as shown on a dyno I would think the numbers would be a bit different
We took a tour of the factory last year and watched them put the SS on a dyno