Do you remember what model plane or engine size? Sometimes narrowing down the search parameters using "Advanced Search " helps.
Any idea how long ago this was??
8-10 years ago (as I recall) or slightly less, AC aero engines was posting some interesting intake systems. ACE engine or something like that. Kevin Eldridge was also posting about them IIRC. He was on here as "Relentless"----haven't seen anything from him in at least 5 years.
Bob Mills also showed his new intake a few years back, but that was on a 6 cyl.