If your running yellow injectors then your gonna be (if done properly, around 15psi altho some have been known to run a little more) stage 1. Stage 2 is light greens (355's) which is the same as stage 1 but little bit more boost, around 18psi...then your onto stage 3 which on its bare min is dark greens (803's) running around 20-22ish psi along with a 3bar map sensor...if your sensible then you would add to this a hybrid T3 (360 bearing) or more idealy a T34/T35 along with a RS500 intercooler.....after this state of standard tuning the road splits up into many directions and fashions which would lead to a never ending topic lol


Stu