Suggestions on air filter for a single 1.75 hs6 su on a minisport manifold , the engine is a 1293. I am thinking of a K&N cone with a sub stack ?

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That's why it's good to be.............ME

I make stubstacks for HS2 and HS4, but for HS6 I don't bother.
Just do what GR does- bung the HS6 in a lathe and machine a decent radius into the inlet port.
This way no need for a stubstack, and less restriction around the insides of the filter.

If you go for a drive to GR's he could maybe do it while you wait.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.