I got the coilovers installed and all of the rest of the wearable suspension parts replaced:
Control Arms and ball joints
Steering rack
tie rod ends
sway bar endlinks ( godspeed sway bar end links in front adjusted .5" shorter, and stock in rear )
coilovers with the 10k/6k rear adjusted to 10 clicks front and rear ( higher clicks made it too stiff, and lower clicks couldn't control it without bounce ).

The result is on smooth roads I feel alot more control way more than stock but on bumpy roads it's annoying. On the struts i greased every metal on metal contact including the pillow ball mounts.

I"m going to replace the springs with 8.3kg front and 5kg rear.

I also found a variable rate spring from Helix springs that's 4.5-5.5kg/mm thats $80 for the set. I was considering a variable rate front spring that can do 7.5-8.5kg/mm but i cannot find it. The reason for the variable rate spring is it will absorb bumpy streets better and in turns it'll use the higher rate.

I'm looking at a GT35 turbo DIY setup with the URD MAPECU3 and O2 calibrator to adjust closed loop operation. I"ve considered a E85 conversion because E85 will be more forgiving for boost and not require timing adjustment ( even though MAPECU3 can adjust timing in boost )

The goal is a good street ride that can make 300-400whp.

 

I did replace the 10k/6k combination with an 8.4k/5k spring combination from Eibach. It performs nearly as well in turns but not as annoying on bumpy roads.

 

The coilover spring dimensions were 230mm x 70.5 mm. The Eibach replacement springs came in 225mm x 70.5mm