Hi, Light blue injectors normally flow enougth fuel for 370-430bhp, Dark blue injectors (standard) flow 200-270, 15psi is stage 1 tune 270bhp as standard is 10psi 220bhp. Being that its 4x4 it should have the 200 block, Running this amount of boost i should of thought that it has a modified chip the only way to know is by removing the ecu and having a look inside.