Minimum air filter size?

[snakebit]

I'm looking to do a cowl induction like this:http://forum.miata.net/vb/attachment.php?attachmentid=25809

The K&N that came with my kit is about 5.5" diameter and 7" overall length and has a filtering surface of about 86" sq. It looks to be an awfully tight fit or just too long for the cowl setup.

This K&N http://www.knfilters.com/search/product.aspx?Prod=RA-0570 would fit better but has a filtering surface of only about 69" sq.

Is that enough?
In other words, is it big enough to suck enough?:oops: :censored:

[Tom @ Fast Forward]

Probably OK. I have seen a couple small filters that I would have thought very restrictive and made dyno runs with and without them (open MAF) and saw no change.

[ThomS]

What is the measurement for the opening of the filter by the MAF ?

[Tom @ Fast Forward]

2.75" ID for the filter fits real well on the MAF.

[ThomS]

Tom do you think if I go to a smaller filter it should not have an effect on the air flow?

[Tom @ Fast Forward]

You can run a pretty small filter at these HP levels. Remember, 200HP is only about 330SCFM air flow. Not a lot of air and it is sucked in pretty hard by the blower. :)