I posted this
link elsewhere but I thought this was interesting so I am sharing some observations.
Second Strike Air Cleaner Calculator
A few observations from playing with the calculator. Oiled felt flows much better than paper or foam. A K&N 9" filter with X Stream top can flow enough air for a High HP big block. And that filter fits in a Turkey pan.
I don't have my car yet so it is all academic to me but the Turkey pan acts as a cool air intake (in theory) and heat shield for the carb which makes it desirable from a technical standpoint.
Acton sells this filter.
MAXX Air System MAXX Air System [427 289 CSX CCX KMP ACE HT SPF] - $267.40 : Acton Custom Enterprises, Custom Metal for Cobras
The only difference's I can see from this to a stock K&N unit is the base is flat no rise like the K&N and there is a button that replaces the nut both of which saves some space. It is pricey but you should not have to replace the elements and they sell different heights of filter. Patrick modified a base to drop it and if you went that path you can save around $100.
By my calculation the top when the rim and center is taken into account is 24.28 square inches for a 9" filter and the 2-1/2" filter is 49 Square inched for a total of 73 square inches. That amounts to a 2 hp loss for a 600 hp, 482CI at 6,000 RPM (my targets).
A 14" x 3" oiled felt filter would amount to a 1 hp loss with the same engine. The Turkey pan has some HP value perhaps which could be argued.
There is the question of the look of the filter, I did not like it at first but it is growing on me. I guess you could have a show and go filter.
My engine is being built. If I could get some clearance information from someone with a Superformance and an FE Blue thunder dual plane intake I
could buy the filter without the car. With that I could run the filter on the dyno when it is time to see the performance change. Could be interesting.