i agree, is that japanese for 'fully sick part'???
Maybe you should learn some basics of extractor design before making smart-arse comments.
A Tri-Y is a 4,2,1 extractor.
The difference being that a tri-y takes into account firing order, so will take gases from #1 and #3 into the first "Y" junction, #2 and #4 into the second "Y"... then blend the outputs of those two "Y"s into the last one.
So 3 Y joints. Tri-Y. They are more complex to make than a normal 4-2-1 unit.