I think you can run an FD tubular manifold, but have to space it from the engine to clear the intake manifolds. An RB header flange can be used as a spacer, but you need longer studs, which can be hard to find.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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