- Apr 6, 2010
What type do u use on your masterpieces?In regurds to @bastarddsm saying 1.5" primaries are too big for 95% I'd have to disagree in a way, this also depends on what material thickness your manifold is. I'll agree 1.75" is way way huge unless your running above a 72mm but most all manifold manifacturers use 1.5" sch pipe weld els, now here is the difference, sch10 has a larger ID than sch40 by a couple mm, so although thicker, the sch40 will have more velocity then it's sch10 counterpart of the same design. A lot of the main shops use sch10 because it is cheaper. But the sch40 manifolds seem to perform much better. Just something to think about.