I've got a 9" cone that I built a box around it and have been very happy with it.
A couple of weeks ago I decided to remove the box and just run an open cone.
The box I built around the cone must have been some what restrictive because I really do have more power now and I'm really thinking about leaving the box off for good and staying with the open cone.
And not to mention my blower whine is a whole lot louder.
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Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.