I beat you, I have THREE Phoenix Gold Xmax15 subs laying around. I doubt they'll make it into the Coupe though... maybe one of 'em.
Your best bet is to make an enclosure that fires the subs towards the back seats (leave some breathing space and pop open the ski hatch for max bass) and isolates them from the bootlid and side panels. They're waaaayyy to thin and you'll loose a lot of energy in those panels.
Back when I had two Adire Tempest woofers ported with 1500w rms total in my Alfa 33 (comparable panel thickness) the side panels would flex almost half an inch on the lowest notes. I'm sure that cost me at least 3 or 4 dB.
Last edited by Orion; 03/10/2010 14:31.