looks like it's relying on the box being the right height so that when the top is put on, it'll just sit around the filter's top edge. Is it tight enough to ensure that the filter won't move at the bottom and thus having the filter fall sideways in the box, not doing anything? Or will this be welded?
Is the bottom of the filter solid, or is it foam as well? If foam, I'd assume then that you wouldn't have the above mentioned pressure fit, and instead suspend it in the box to make use of that bottom surface area.
Mark P

Dyno: 469wHP / 451wTQ
93 oct - best 60':1.734 | best 1/4ET:12.239 | best 1/4mph:116.58
100+oct - best 60':1.698 | best 1/4ET:11.762 | best 1/4mph:121.72

ECUx template version 11.16 (3/12/07)
AWD Dynos by State - Race Gas in New England - B5S4 100k+ mile post
Current:
'02 Audi S4 Avant, Imola Yellow, APR Stg3 - imolavant website - 181k miles
'01.5 VW Golf 4dr 1.8T, Satin Silver, GT28R, EPL-tuned - 14.8 | 101mph - 195k miles
Previous:
'00 Audi A4 1.8T, Silver - Quattrobonium website