I was wondering if the following HU would be easy to integrate into the element, keeping the factory sub, amp, AUX, and speakers?

It has a sub pre out, and also an aux port.... but from the specs do you think it would be a good choice? Ultimately I plan on adding an amp and speaker box, but for now i just want it to integrate with all the stock items.

http://www.crutchfield.com/S-P2g5LnoQ2My/cgi-bin/ProdView.asp?g=300&id=features_and_specs&i=133C7401