I use the gold spring , you won't notice any big difference in power, it will lift your F/P and atomize the fuel better.
If you are after more power you need other components.
Fill you signature in and we can see what mods you have already and you can be advised better.
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03 F250 4x4 CC 7.3ltr 4R100HD rebuilt, 160,000 Klms
GTP38R , Turbo-master , IH Bellowed up pipes, RiffRaff CAC boot kit, AIH delete, .
4" Turbo back exhaust ,Banks power elbow, LPG (Gas over diesel) DP F6 tuner, 40hp tow, 60hp tow, 80hp tow, 60hp, 80hp, 120hp race, Decel, 1200 RPM.
RiffRaff 6637 intake ,pre filter, Snorkle
Custom made trans cooler with twin thermo fans ,water to oil cooler
Scangauge 11,AutoMeter Trans temp, pyro ,Water/Oil temp, Fuel Pressure, Boost.
Longrange 120 ltr fuel tank and transfer pump, 15,000 lb winch, Warn winch bar, Lightforce HID spot lights, HID headlights, Black Widow Drawer System, Snugtop Canopy with gull windows, Fr & Rr ARB Diff locks, Hornblaster Train horns, Post fuel pump filter, RiffRaff FRx and HPx , Bilsteins x4, Onboard compressor , Air tank and water traps, Billet door handles, Alpine headset, Alpine overhead DVD player, Rockford Fosgate sub, Alpine amp and CD changer.