[88 supra turbo]

I just purchased a lexus afm Ls 400. Do I need to upgrade my injectors if i am running stock boost 6.8 psi. Some people said if you was not running high boost you dont have to upgrade your injectors. I read also some people said the afm sensor on the lexus Ls 400 would work without swapping you stock one. I also was wondering about the adjustment screw inside the lexus afm. It has the factory screw but I was reading that you need a longer one. Any info. would help.