Help, need some bolt on build help.
 

Ok, so I am buying my first 300zx in three days now. Mint TT w/ 88k all during summer months. It has a nice catback and intake and thats it... I am immediately doing a few things including:
Enkei Racing RPF1 17x8.5F & 17.9.5R
HICAS delete
4bolt downpipes
ECU & 15psi boost jets

what I am wondering is how much these would help?
Z1 SMIC
Water or Water/Meth Injection
U/D pulley set
550/555cc injectors

I expect around 400hp and able to handle it well with the above setup and am just wondering if the below mods would help this setup (NOT looking for big turbo or big power yet)