Originally Posted by boostzealot

RWD4g63, yeah i figured there would be some loss in spool by how big the primaries were but with testing this manifold's design and purposes i wanted a different combination. Mostly we decided to go with the 2in primaries because they would be able to be removed from the restriction of flow at high flow rates like what we were planning for this setup along with the fact that it is twin scroll I figured I could sacrifice a bit of spool with going with bigger runners which let me have some more flow up top. I did get some feedback from some friends who build manifolds say that the runner size would help let the gases expand a little before getting to the small t3 twin scroll footprint and that this manifold would be better suited for a t4 setup but that it would spool like crazy for what it is and sure as crap it spools very nicely.