I would get the active intake just for back up. Those Daytons arn't too strong IMO. May work, may not, but it would be a pain to get it all together then find out that you should of aded the active intake. If you don't need to use the active then you just turn it off, and the hole that it is running threw can still be used as a passive intake. This is the way I did my cab. Some days when it gets too hot I use the active, and on cooller days I just turn it off.
Adieu