I was researching this on here...most of the questions came from 5.0s so I'm sure its different. I have every bolt on except UDP. Should I upgrade from 19# injectors to 24# or even 30# (excessive?)?? If so when I do and get it tuned, with a new MAF, would I notice a difference in performance or hp? Any info is helpful thanks. The car is an 03 GT.