hi i have just got a rst s2 what it is it has 5th injector on it in dash boost control bigger turbo the head has been skimmed ported,285t2 cam plus pully, ive been told it has around 230bhp....im just not sure when i should be switching the 5th injector on as dont want to do any damage..what sort of boost shuld it be running aswell.

thanks paul...