I went to a car audio show this weekend and a guy had 2 12" Alpine type R's in a focus hatchback and 143.9 db. I didn't get to see his set-up or what type of box he was using for those speakers.
I talked to RE today and they said they no longer make the SEXXX. They said the SX replaced the SEXXX. The SE and SX are both on backorder and wont be in for like four weeks, so I guess I will have to wait.
I had the same problems contacting Fatmat, so I contacted my credit card company and disputed the charges. They credited my money back and I ordered some sound deadener from b-quiet.com and received a tracking number within 30 minutes of my order.