if it has 2 O2 bungs, wouldn't you just drill a hole in each header? So that would be the same with a 2-1 exhaust; just make sure you drill it in the area before they merge.
If that can learn on its' own, and doesn't need a power commander, that sounds like the way that the 250R should have come out in the first place. And this kit is what, $500? sounds good to me
now I want to adapt this to my pregen, or get a newgen just for this, or both