K sport kontrol pro dampers. Adjustable etc.
Your spot on with the diff that and i would also like to do some circuit racing with it so it will be good for taking the tighter corners under deccelleration and it will still have the potential of kicking out under load and turn.
I'm not going as extreme as full sway bars over angle steering and hydraulic hand brake though.
To compensate for the diff when i get the gearbox rebuild ill look into getting an extended 5th gear to keep the freeway rpm down to 2500-3000 as per factory, Its the most annoying thing about higher ratio diffs and figured because it needs all new synchros so why not get it done.
Funny you should mention about the stock r31 as the guy who is right into it started with the exact same thing, rb30 with a minispool.
Since then he has done an rb25 conversion now sporting a high mount gtx3076 with 4.11 mechanical locker hydraulic hand brake etc, tuned at 300rww.
Even stock he could hold that sideways around a round about for as long as a set of tyres would last.
The skill envolved with drifting is amazing.
My car is a 200rwkw s14 with all supporting mods, just needs a bigger turbo and tune to make 270kw or so atw. 300 if I'm game...