There is a pic I found on Google where someone at a shop in Atlanta used JL subs. Personally, after reading up about shallows vs normal subs, I think you won't be satisfied w/ using a shallow in general, and even more so w/ such a small subwoofer. Also, @ $60 a pop isn't gonna be very cheap. I got a Kicker L5 DVC sub for $90 shipped. Are you trying to upgrade the sub w/o upgrading the amp as well? If that's the route you're going, I think you're really limiting yourself since your will never have direct control over the sub w/o using a dedicated amp. I don't remember the ohm ratings of the stock subs, and I have no clue of their RMS handling either. The problem is that if you had a sub that can handle more power, but are using (in your case) a factory amp, you'll actually have to turn the volume up more in order to get the same amount of sound. I got a JH300 monoblock amp off ebay for $90, and it's more than enough power to run my Kicker sub.
The factory subs are actually dual voice coil units w/ decent sized magnets. I just think size is going to matter more than anything. After seeing about 3 different homemade versions out of MDF, 1 version remaking the face of the stock enclosure (which I'm going to do) to fit an 8 or 10, or the two aftermarket enclosures...I think you might just have to bite the bullet and take one for the team. I've never fiberglassed before, but I'm going to be following this thread
Xoutpost.com - View Single Post - Custom Subwoofer Enclosure and Amp Installed
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