I reckon XRAY will do very well. I was reading an article in RACER a couple of weeks ago; apparently, they've managed to knock 3 grams of weight by decreasing the front outdrive diameter by 1.7mm.
they've also changed the material used for those parts from spring steel to hawaiian titanium. or something.
all these changes, along with bigger diff balls, are expected to reduce average laptimes by at least .03 of a second
