It appears my car is just unhappy trying to mount anything much larger than a 10 so I'm thinking the single 12 ported just isn't going to work. I'm looking for a pair of really nice sounding woofers that take a box smaller than .7 each. I'm thinking of subs like the TC's, IDMAX, OZ Matrix Elite, JBL GTI, etc. Basically something that has 20mm of xmax or more and works well sealed. I've got about 1,500 at 1 ohm. Thanks!