The FU and FU2 package use the same chip. Someone will correct me If I am wrong but the only difference is that FU includes a bunch of standard calibrations that you can burn to your chip. It's a pretty simple process of selecting programs from a drop down list. The FU2 includes custom tunes for additional mods.
With your current mods get the FU package and when you add stuff like injectors get some custom tunes.
There are a couple different Fuel sipper calibrations that come with the FU so your best bet would be to give them all try.
Scott
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