Holy cow the RT660s are so much faster. I went from 4-6 seconds back from the fastest drivers to 1-2. Still getting used to the car with them on so hit a lot of cones today, but man the difference was really noticeable.
Also a DSG note - APR's DSG tune with auto upshift turned off doesn't work well. It still auto upshifts on launch control, and then seemingly randomly besides that. So many double-shifts because of this, really kills your flow and one time even shunted me into a cone because I wasn't expecting the nose to be heavily weighted. It definitely works sometimes though, because I hit limiter more than once and the power just evaporates.
The 255/40r17s just barely clear with my setup. Stupid wide compared to the RS-4s of the same size.
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