That's interesting Dan, I see you've clocked the housing and welded the 90 degree outlet from the ko3 com housing onto the ko4 cold side
Impressive stuff. Custom actuator bracket too given the clocked housing?
Yes clocked housing and then k03 outlet is welded on to give an indentical k03 fitment. K04 housing is obviously bigger so it needs modifying to fit and the actuator bracket is a stock one but redrilled to fit and give correct movement on the waste gate.
Turbine housing is machined and ported to flow better and be less restrictive
While the turbo makes the power it's definitely down to the other parts and the map that gives it the performance it gained.
I believe 300bhp is achievable all be it a different spec ie comp wheel.