Didn't you email me about this same question?
needed are.
hybrid turbo
tubular manifold
fmic
intake pipe,
s3 maf
s3 injectors
intake pipe.
good for around 270bhp
i started a thread a while back on this and admittedly been a bit slow but hoping very soon to pick it up again and run a definitive guide on this , starting with a stock 163bhp , then adding fmic, then tubular manifold, then decat, then hybrid and its bits and logging at each stage to show what is capable.
I can as we are currently testing fit the internals from my 312bhp k03s hybrid into the k03 longitudinal turbo housing. So potential is there , however what isn't know is how restrictive the k03 turbine housing is and how much detriment that'll have on power. We will see.
If you want to keep a completely stock setup then run a k04-015 type turbo and that's good for around 230-240bhp.