I guess the 996 kit has quite a short TB and manifold and a long trumpet?
the total inlet tract length from the valve to the end of the trumpets is all that really has any effect, which you could in theory make using a variety of combinations of spacers, manifold and length of TB
This is why I had to cut the heater box out of my engine bay, otherwise on the 16v you can only fit 30mm trumpets with gauze filters.
Now I have 90mm trumpets on with a full size air box