Power wise, it feels like stock, maybe a little more giddy up, but ipi can definitely tell in Parkin lots and the city. It'll light up the 37's on dry pavement like it's nothing.
But on the highway, you definitely feel every gust of wind. Phew.
My speedo is off by 7-9 mph on highway depending on my speed. At 70 it reads 79-80 but at 55 it reads 62.
In the city it's generally off by about 4 moh up to 45ish.