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I would recommend against it. The steel there is quite thick and it's 'corrugated' to some degree making me think it's structural. Ours cars are affordable as it is... Hence my guess. Also, since the trunk isn't sealed like an M5, even more reason for the added strengthening and stiffening. While 6inch slots may not weaken it much if at all, i think the seatsdown idea is better anyway. You could be suffering from backwave issues too. What type of Box do you have? Sealed or pitted? If sealed, what shape/cOnfiguration is it in? Is this box from a different car?

Your claims of 6 db gain by simply firing at the corners of the trunk is a little unwarranted. True, gains can be had by finding the sweet spot but sub positioning is not an exact science or at least the average enthusiast does not have the time or computing power to calculate this. Raw science says 6th can be gained by doubling power and doubling cone area.. But it has to be both. A 6th gain out of the same subs will be incredibly difficult to achieve in the fortes trunk by mere placement, especially with your subs. Regardless of sealed or potted, 3 10w7s take up a legend amount of room if you've built both boxes to spec. Coupled with the fact that the space inthe trunk alone will barely be enough afterwards to give birth to full length waveforms. You may be able to get a gain in db due to the fact that in their current configuration the box is inappropriate and a better box might see you get back to an 'at-par' scenario. I have 2 10w6v2s and I know they suffer immensely by the lack of space, versus, how I wanted my box to look.
 
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