From the RDS website
Stock = ~98cc
Stage 1 = 160cc and stock nozzle
Stage 2 = 160cc and larger nozzle
Stage 3 = 230cc and nozzles 100% over stock
If all you want is a little get up n go with no plans for more powah down the road just get a single shot stage 1 injector. That's all I got and with my rig I tow a 22.5K trailer with no real issues.
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the  1997 F-350 XLT 7.3L PSD 4x4 CC LB BTS E40D Manual Hubs 4.10 36000 miles when purchased 4/1/06. Mods - ISSPRO Performax gauges, Tymar intake, Tymar 3x4 DP to 4" ss exhaust, electric fuel, CCV mod, tru-cool 4739, Swamps 175/30% injectors, stage I Stealth pump, D66 turbo  Spearco 6.0 cac, BDP live tuned tuned 442hp/860tq.
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