Whats else can I upgrade

[javadave]

Ok, got my emissions passed
Have had the car 2 weeks, put 1200 miles on it, yesterday started steaming through the ac vents, so today bypassed the heater core, took it to my shop and did a rotate and balance, rides like a dream now.
The car came somewhat modified already like this
cat-back MagnaFlow dual exhaust
no idea what brand (yet) single cone air filter
z1 upgraded ecu
25k on rebuilt ( with shift kit? ) auto trans

My plans for it
new spark plugs ( anyone used the Iridium plugs ? Are they better than platinum ? )
new style fuel injectors
silicone hoses throughout ( coolant / vacuum )
bigger throttle bodies ( does this make a big difference ? )
Timing belt, cam seals, tensioner, water pump <-- should I go Kevlar on the belt ?

What else could I do besides converting to TT ?
Your suggestions are greatly appreciated

[RubyRed300ZX]

Iridium is platinum. More precisely, it is a member of the platinum "family" and nearly 90% of what is mined in the world goes into the production of spark plugs. Short answer is yes, you can use them.

[Retro-Cow]

Hello,
I definitely recommend reading this if you haven't already.

everything-you-need-to-know-about-the-z32-t508376.html

Particularly the section titled "Destroying the World in your Z32." Should answer a lot of your questions. My other recommendation is to make sure all your maintenance has been done. Ie. your compression is good, you have no vacuum leaks, etc. before you start upgrading. I made the mistake of just jumping in and installing performance parts and I tell you I regret it.

[DCaff300ZX]

^^^^Best advise possible, the Destroying the World section is something you should copy and keep for reference for the life of your Z32...covers it all.