So I WILL need the fuel injectors if I go over 170 to the ground. I mean granted I dont want to run pig rich or lean out and detonate either. Would you recommend the injectors at all with these mods:

Headers/Y pipe/Catless exhaust (borla)
Aem Intake with HKS air filter
Upgraded spark plugs and wires
SVT UIM
SVT LIM
SVT 65MM throttle body
75mm MAF
...
Is my fuel system returnless right? Using the LIM on the 98 would be pointless and using the 98 UIM would be less beneficial than say an ST200/SVT from 00 on up? You guys are a killer help THanks.