I modified my ebay style manifold, and it help up surprisingly well. I pushed my car hard on the track all year.
I think many of us are in the boat of not needing the most perfect flowing/equal length/divided manifold with twin gates. That just adds to the cost.
I am currently working on an RB manifold made from sch40 steel. I am avoiding stainless for a few reasons. Cost mainly though. With stainless the materials are more expensive, need to backpurge and so on. I own a RHD car so clearancing for LHD may take a bit of tweaks. I am building my own as we speak. I intend to sell one after for just a touch above price of materials/supplies only to see what that person thinks and how it fits. It will be t3 single gate non-divided and not equal length. But I am attempting to make the runners close.
