At first we thought to copy ACF bottom mount, but after i go through many logs from speedtech, CES, Motiv and other bottom mount short runner kits, and have in mind what stock N55 manifold could do and that the stock manifolds are short runner i decide do it. And i think its better design then some other peoples logstyle tubular manifold where runners hit 90deg straight into the big pipe. So actually i am pretty sure design is pretty good. And in a matter of fact those are not only pipes and elbows, but many segments matched together perfectly and then polished and the diameter expands itself all the way to the T4 flange. I told my welder i want a shortrunner bottom .oiunt and he tried do it the best way possible. He dont want to show me pictures from the building process like with my old manifold because he dont want to show his way of building it. Ill ask him again, but at the end we will see the results and i dont want to sell it to anyone so the props and cons will be for me.