I'm getting my F2 kit tuned saturday. I would have had it tuned monday but I had to replace a hose and wasn't able to make it. I'll give you the numbers probly sunday. Both kits are built similar. mainly just a different turbo. The piping for the stage 2 is run the same way for both kits. However FS comes with rubber oil line which you have to pay more to upgrade. F2 comes with the SS lines. FS comes with a regulare diverter valve, F2 comes with the turbosmart hybrid that FS offers for extra $ which you can set to blow off or divert or both. F2 does offer remote tuning for those who don't live close by like FS. FS piping is steal which if not taken care of will rust, F2 aluminum which is also lighter for those who like to save weight. Thats all the issues I looked at before buying my F2 kit. So I saved a bit of money and still got a hight quality kit for my focus. oh and yes it does say the F2 is 39lbs injectors compaired to FS 42 however according to bosch who makes both sets the volume of fuel delivered by both is 42lbs. That was another thing I looked into. Also with the F2 set of injectors you don't have to splice wires for the new injectors. Just plug and play.
P.S. Also for got to mention the F2 kit comes with a dual stage boost controller. And the cheaper F2 kits don't come with tuning for those who would like to get there tuning else where. Kinda like FS does.