when i bought my car it came with the denso injectors not fitted.not to bothered about more power as i feel the car is fast enough.its running up rated boost on hks evc at settings of 1.0 bar and 1.2 on high. uprated clutch and turbo ect.are those injectors really needed or is it only needed for more power and boost? also i forgot to add my apex safc needs setting up. will i need them for that set up?