06 acura tl, how to add power to stereo

I have a 2006 Acura TL with navigation and I am looking to add more power to the stereo system while keeping all the functionality the same. The factory system is pretty weak, and I'm thinking adding an amp would do the trick, but I was wandering how I could do this and still keep all the functions the same such as the steering wheel remote, bluetooth, navigation etc. Also, does anyone know the specs on the factory system in terms of the head unit, any amps, and speakers. Maybe replacing the speakers will be necessary when adding an amp, and I want to make sure I am actually upgrading. Thanks for the help.

These are some of your best options for adding an amplifier to a factory head unit. http://www.mobileaudiocontrol.com/dept.asp?d_id=17612&l1=17612

thanks for the info. Now, I need to figure out the wiring specs as well as those for the speakers so I will know what to upgrage. I appreciate your help!