I just finished the wax molds to investment cast the manifolds in silicon bronze this week.
They will be available in 3 configurations.
Standard 4 bolt 1-1/2" Linkert
38 mm Mikuni
40 mm Mikuni
They will be ready in about a month.
I have not even sent the molds to the investment caster yet.
Also working on manifold for the Indian Scout to take standard
Indian 3 bolt, 4 bolt 1-1/2" Harley or 38 mm Mikuni.
AHRMA Dirt Track # 67J http://www.enfieldracing.com