Have an 03 tib s/c currently running 3-4 lbs untuned sitting at a perfect 12.1 afr all the way through the rpm band. stock injectors. big walbro fuel pump. also have mafterburner installed. If I were to up the boost to 7psi, and increase fuel pressure, would i HAVE to change the injectors or could i manage a decent AFR with the stocks and a mafterburner tune?