upgrading 1987 turbo

[Prez420]

I was wondering what other obvious upgrades I should do during the winter. given that Im doing a bunch of upgrades in the winter already I thought I would ask the question as to what other upgrades I could easily be doing while I have it off the road and her guts on the floor? price isnt a big issue for me.

already have:
3" stainless cat back
K&N air filter
18x9" Stern ST-1 Beast rims
235/40/18 Falken 451's all around


on the way:
Koyo Rad
Brembo drilled rotors and kevlar brake pads
XTD STAGE 3 RACING CLUTCH KIT
Cooleeze turbo inlet, rad and IC pipes ceramic coated and polished
BIC Performance DDP ceramic coated and polished
BIC Performance test pipe ceramic coated and polished
LS400 Air Flow Meter AFM and 550 injectors
Monza SSQV Blow Off Valve
Stainless Steel Brake Lines
Clutch Stainless Hydraulic Line


thanx for your help