Bought a Honda Pilot. The system sucks. I would like to beef it up, more volume. I have no problem installing an amp and swapping the factory speakers for somethings better, but I would rather not touch the head. I have heard conflicting information from the audio shops in my town. One guy told me that a aftermarket amp and speakers would sound horrible with the factory head. I am confused. Is it possible to make significant improvements without replacing the head unit? I'm not looking for award winning sound, I would just like to crank it up and rock out once in a while without all of the Honda factory distortion. Please help and thanks.