I just installed the kicker upgrade. It replaces the 4 door speakers and the sub box under the back seat. After looking into replacing everything or messing with door speakers this was a smoking deal and sounds amazing. For the $500 upgrade it was a no brainer for me.
Was there anything special you had to do for the install? The product description says that it's for non-Sony equipped trucks, so I'm curious as to where that comes into play. Maybe up behind the head unit?