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I have the Minispeed 1 3/4 manifolds on the Twini, and Minispares on the wifes car. Not sure on the part numbers but they are similar shapes.
The Minispeed manifold is slightly flatter / longer making it a bit tighter for the air filter.
I use the K&N cone type and it just fits without any mods to the firewall. Still use the standard sound insulation, but need to watch the location of the speedo cable.
The Minispeed may be marginally more efficient, but I reckon it would be hard to measure the improvement.
Either way you need to check the manifold lineup with the head and carby as I had to clean them both out a bit.
If you are anal about chasing power, go the Minispeed.
This all relates to the HS6. I don't know about the latter style HIF SU.
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