TOC
1. The ECU
2. The FPR
3. The Injectors
4. Controlling the "CO"

The electronic fuel injection control unit(ECU):
When upgrading the injectors, You should upgrade the chip to a optimised version for your engine set-up.
But you could also upgrade the chip if you got the regular injector too! This will get you more power and a more efficient engine. 
The regular chip is a compromise! TO fit all markets and all applications.   

Upgrading the chip, do this:

Remove the stuff that's in front of the ECU


Loosen the ECU and remove it.


Time for operation, "Nurse, Screwdriver please!" 


After loosening the circuit board turn it over and locate the "Chip"


Carefully remove the original chip


Insert the new chip, and check that the new chip is inserted in the correct direction. This could be expensive if done wrong.


Just put everything together in the reverse order of removal and you should be fine.
  
The fuel pressure regulator (FPR):
When going for more power you'll need to rise the fuel pressure in the fuel rail.

- Static (ordinary)


I will show you how to exchange the FPR, here... 

The injectors:
My high-performance injectors...

They are Bosch 0 280 150 431, which are rated for aprox 70 hp/injector. They will do. (I hope)
I will soon change to these and I'll put up the DIY here

Controlling the "CO"
The CO (carbon monoxide) is one of the things that needs to be checked and set.
How to set it:

LH 2.2
Inside the AMM (Air Mass Meter) is a pot that controls the CO.
You can access this pot from the top.
To lower the CO turn counter clockwise, to rise turn clockwise.

If you want to verify the setting, disconnect the cable. Measure the resistance between pin 3 and 6 on the AMM.
A good value should be near 380 OHM