lol see my r32 actually runs 255's with no stretch on factory GTR rims, my spring rates are 12kg and 10kg front n back with matched shocks (no coilovers), which gets rid of some of the nasty arse squat and lateral sway. then there's the underbody bracing, the welded in square tubing, the passenger foot well cross brace and the strut braces, which should improve the rigidity, factor in the adjustable upper and lower control arms, castor and toe arms which let me dial in just the right alignment for max grip... and I'd dare say my car would handle a LOT better than yours, even with the AWD bits weighing it down up front.
I don't need to handle 280rwkw, i just enjoy feeling like i'm driving on rails with 200awkw.
My shit slow ceffy on the other hand, scrapes rails on manhole covers and cat's eyes and runs moderate stretch (225's on 10" is nothing revolutionary, and its still within the specifications of the manufacturer)... will I ever race it or dyno it? don't hold your breath.