Little update
I didn't had time to do the alignement but i went for a drive last night to some of my favorite roads, changed the tyre pressure to 2.2 front and 2.3 rear and the car was pretty good !
Actually it was very good, little no to understeer, it never ever tried to rotate on my in the rear... looks like the tyres needed 500miles of beading in cause they changed from ice to fire suddenly !
Car was very good i am very happy. Just received the two front NSX-R bars, NSX-R sway bars which i am gonna install soon.
Found another problem though, my car is vibrating a bit under hard braking. Can't feel it below 40mph but above it is noticeable.
My disks were checked and are perfectly fine, the front pads are new ( rear are very old ). I have a feeling something is loose somewhere or maybe that could be my shitty aftermarket exhaust which touches something ?