I'll have more info, especially pricing, tomorrow.
As far as fitting a 10 or 12, unless you're willing to give up the entire passenger footwell, you are NEVER getting a 10 or 12 in there. Most guys do a JL 6W0 in a small box, so we're somewhat pushing it fitting the 8W3. We are fiberglassing the box to the floor to gain the added volume of the uneven countours etc to keep the size down as small as possible. Remember, you need a certain amount of cabinet volume behind the driver, less the displacement of the driver itself and the Q factor to make the driver sound good. If a JL 12 wants 40 liters of volume and you give it 18, it is going to sound worse than the 8 which was designed to run on 18 liters of displacement.
I have seen guys with 10s or 12s in Boxsters, but the only way to do is is to give up most of your front trunk to the cabinet, and have someone who really can do his homework design a tuned ported enclosure using the RHD steering shaft hole to port the sub into the cabin.
If you want a sub in the footwell, a 6 is easy, an 8 is somewhat pushing it, and anything bigger (or deeper, hence the 8W3 not the 8W7) and, given some slight practicality, its just not happening.
Patrick
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