That's really up to you.
Maybe do 65dd then 80 or 100 performance, but do not do any tune 15hp apart in the same class(dd,perf,race,etc).
You can also try to get a hold of Bill on Tuesday before you make your order. He would be the best to explain differences and recommendations.
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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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