FWIW, the K & N round filters will allow the stock velocity stacks to remain in place but they are a pain in the $%^ to fit and bolt on.
Factory backing plates/stacks are common on Ebay and on the z car sites. Expect to pay form $40-$75 on average with some going much higher.
The Pipercross filter with factory stacks and backing plate with a "modified air cleaner backing plate that has been extended and insulated" seems to be the ticket according to Katman. He even posted his up on here not too long ago IIRC.
I have all of the parts to make mine just haven't found the time. Hopefully by CMP it will be done.
Paul Ballance
Tennessee Valley Region (yeah it's in Alabama)
ITS '72
1972 240Z
"Experience is what you get when you're expecting something else." unknown
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