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The only thing on that list that will give you noticeable power is the water/meth. But if you plan to run meth in there, make sure its no more than 50%. And you better get Tony to update your tuning for it.
Fuel mods will probably net you a few ponies, but you might not feel it at the SOTP. Although I have played around with fuel pressures at the track and noticed differences on the time slips. The benefit of fuel mods is less air, smoother and quieter running engine. The stock fuel pump can provide enough fuel for stock injectors, unless the pump itself is bad. In that case, replace it with the Walbro.
IDM mod.... many people report smoother running engine and snappier response. As for power, probably won't notice that much.
At this point, either injectors or big oil is what's going to give you more power.
RDS, 5 months about 4000 miles on them, paid 1330 new, will send them out to have them checked over and new o-rings installed. stage two 160cc single shots, remanned. 80% over nozzles. 1000 obo
Now putting on Body Armor for the die hards that refuse to see the obvious. But hey, they say it cannot surge. Wonder why? It makes no HP, that is why. Glorified WW design on mild steroids with no longevity. Discontinued BTW. Nuff said.
EDIT: get rid of that 203 thermostat too, jeez. That is one of the things that Bob came up with that sounded good at first but I disagree with.