Early exhaust manifolds

[CarlosV8]

I've acquired a set of early exhaust manifolds and downspipe, the ones with the bolted flanges. These look like a much more sensible design than my current items and I'm tempted to swap them over when I renew my manifold gaskets, as apparently the downpipe will mate up with the rest of the system.

Is this a good idea? Or despite the difficulty to install the later manifolds do they flow better?

Cheers
Carl

[spend]

I've had newer manifolds & Y converted to the early flanges, even Trick at JP (who did the work) said he thought the bolt ups were far better.

[CarlosV8]

Might give it a go then. Can always change back if there's adverse effects!