GZE pulleys NEW question

[Okami]

Hello everybody,

I got some questions about the 4aGZE crank pulley kits etc.

I know about NST - I know about T3
(tho I have no idea of what he means by using a 4age idler pulley etc.)
I know about pulley bros.

Tho my gut is telling me I should look into the NST pulley kit as it comes as a complete kit.
Since I dont have a 4age idler pulley regarding the T3 crank pulley.

What do you guys think and how do I install - for instance - the NST Kit.
It says it goes from .8 to 1.3 / 1.4,5 PSI
How much gain is this?
Somebody told me once - get a pulley kit and go from 145bhp to around 170/180bhp

Here are pics from my engine/front.
http://imageshack.us/g/819/gze4.jpg/