K04/064 And OEM TSI have very different cold side housing shape. You will need custom piping to fit a K04/064 in a T6 TSI you will not be able to use the OEM Electronique dump valve unless you get the housing of K04/064 machined to do so.
K04/064 will never make the power of a TTE450 ( Hybrid OEM IHI JH5 T6 TSI turbo)
On AUDI B8 2.0TFSI same engine as T6 TSI the Highest ever MAF reading with a K04/064 is about 295Gr.S most are around 280G.S
With My TTE450 my MAF reading is 342G.s so about 16% more air flow than a K04/064
I make 487BHP and 610NM with a T6 TSI JH5 Hybrid ( TTE 450).
JH5 OEM T6 TSI TUrbo has Bigger Turbine wheel ( hot side ) than à K04/064
JH5 turbine from T6 and AUDI B8 2.0TFSI is 44/52mm
K04/064 is 44/50.5mm
here are some turbo spec I collect a few year ago when I wanted to choose my turbo
View attachment 303452