I can assure you that upgraded injectors can have a significant impact on egts.
I recently fixed my excessive egts I was getting on DP tuner by replacing it with php chip. Could not get over 1100 deg wot empty.
Just added 250/100 injectors along with custom tunes and I can hit 1200 pretty easy now. Makes me almost wish I never did the injectors. Still not nearly as bad as egts when I had the DP, but not a whole lot better either. However I have a ton more power.
I am not sure what effects you would have with stage 1's though. Might just follow Cleatus's rec.
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03 F350 7.3L Auto CC LB Dually 410's (LS Rear)
DP F5 w/guage style switch. NS,Stock,1200RPM high idle,60t,80e,120r
Nexus Guages (TT,FP,BP,EGT), 4"MBRP Exhaust. Coolant filtration system,203*stat and billet housing, AIH delete, HP X-Over line. (Baldwin PA2818) Bellowed up-pipes; TN Turbo(non-BB), BTS VB, In-Tank mods. RR FRx & Boots. 6.0Tranny Cooler
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