Thanks to all for their input, I appreciate it.
The 12mm Bing is gone so I'll have to make do with the 14mm Bing.
I do have the 14mm intake with the rectangular port end.
Obviously (going by those who have done it and got benefits) drilling additional holes in the balls helps but I'm trying to get an understanding of how that helps when ALL exhaust gas must enter and leave through the two drill thru hols in the tube that has a 6mm rod going through it.
I guess my dilemma is why add more holes in the balls to get more gas through faster to be throttled back down by the two holes in the end tube.
Again, based on your experiences I am persuaded it works without doing anything to the end of the last ball I just struggle to see how.
On a similar vein why drill holes in the inner tube or take the constricting tube out when everything still has to get out that final (constricted) tube.