Check out my post...
Front strut brace, does sweet F all but is STi and looks cool (as mentioned previously, cheap as chips so why not).
Ultra Racing 21mm solid rear sway bar, generic adjustable endlinks from BNT. MASSIVE improvement, highly recommend as up-rated RSB.
Ultra Racing 2 point rear lower brace, unsure of the benefit alone as all these components were installed together... Probably does something.
Ultra Racing 4 point front lower 'K' brace, won't fit my model - is sitting in my garage...
D2 adjustable coilovers with 32 way damping and front camber plates, biggest benefit to handling by lowering centre of gravity and reducing body roll (along with RSB).
Truhart (not the best brand but they work) adjustable rear camber arms as too low and need to correct rear camber...
Bridgestone Potenza RE003.
Harsher ride provided by the adjustable coilovers which is my preference, all other bracing etc wouldn't sacrifice comfort in my opinion.
Still the VERY BEST handling modification you can make is to purchase a good set of tyres, no point having all these upgraded components with some cheap and nastys on all four corners (god forbid they're mismatched too). The RE003 I have currently are incredible and I doubt I'll ever buy another brand/model of tyre again.
I love this set up, I throw this car into corners at speeds that others would only dream of! Always holds its line and has ZERO body roll. Peace ✌🏼