K03/K04 Hybrids?.

i have a tip 2001 s4.
and my turbos are probably on the edge of moving on to a better place.
i dont want to run k04's... because... its an auto, and i dont really see the point.
plus im goin to buy a manual or an RS6 when i get out of school and can afford it.

but my friend mentioned you can get k03/k04 hybrids turbos,
[apparently a k03 housing and k04 internals?]
i already have a set of slightly used k03s in the garage waiting to be transplanted.

i havent owned an S4 for too long so dont call me out on this,
but will it give me more horsepower?.
and where can i get it rebuilt?
Is it possible to do it myself?.

every time i search i get BuehnEngineering.com
but everytime i go there it says it doesnt exsist?.