could just be software. For example, in the 01 Audi S4, its rated 250 horsepower from the factory. A stock A6, with the same 2.7 TT engine is rated at 225 hp. That is simply software...so this probably is too, but i could be wrong
Think about it. You`re designing a car and have a target horsepower range. To maximize drivability by limiting lag (plus probably saving on costs) you install the smallest turbo that will achieve the target power level.
hmmmm. oh well, i guess! I do think it is kind of dumb for them to use a different turbo on the same engine... just build 'em all in one place and drop 'em into either a ms3, ms6, or cx7... thanks for the help, though, good thing I didn't buy it right away!