Actually if you want to get technical, you can build a little bit smaller box if you face you sub with the magnet outward, because the magnet/frame assembly takes up some airspace. So you can save some trunk space by facing it outward, but it is minimal at that...

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)