I'm gonna put 2 12 inch P3's in a dual vented box in my dodge neon and I'm just curious from people who have scene these subs in action or a similar setup how loud it will be?

There gonna be the 2011 models that pump 600 watts out a piece for a grand total of 1200 watts rms, and the 1000 model has enough power to supply them with adequate enough of power to get the power field taken care of, just curious how it will shake the car and if people would here me outside the car or far away; thank youu