New carb spacer from Don @ FBO

Mad,
No offense taken or meant to be given here either. The fact is, the first thing air does in an intake, after going thru the carb and picking up fuel, is turn 90° at least once. The HVHs and now FBOs will help smooth out flow in a linear direction and to a small extent help "pull" along the air behind just as Ramcharger says. But in a header, the merge is in a straight line. In an open plenum, like a tall single plane or a tunnel ram, I know there are gains. On the typical short single plane, or any dual plane, they will not do that much.