I have mine running off my orion 2500d at .7 ohm and it is the loudest single sub setup I have ever heard. I think you will be good with it.
As far as loudness, I had 2 RE HC 15's off 2 JBL 1200.1 and switched the sub out for the 18MT, still running off the 2 jbl's, and the HC's were louder. I then switched the amps out for an orion 2500d and now the MT is way louder then the 2 HC's were.
Meade to 2 18's in his Civic (sealed I believe), so it can be done. It won't be the easiest thing in the world though...