First off, I would recommend swapping the factory H/U for something Kenwood....
but that's just me, I really
like their stuff!
I mean line level converters work for factory decks an all buuut
I'm ol'skool an if you want really stupid(LOUD)
music like me
you go with the best!......
I've only spent approx 800 bucks on my Audio set-up
an I can blow the doors off of systems
that cost three times that much
just replacing the deck will open up new doors as there are alot of options not available in factory units..... sub-sonic filters for front/rear/sub channels, Dual zone capabilities, BlueTooth streaming, ETC.
come tax time I'll have a really nice KenWood BTC838 H/U I'll make you a Good deal on....and
If you have a current music player/capable phone with BT you'll be able to stream your music to it like I do now (no more CD's or Ipods connected with a cable)
Make/Receive calls, view text's, play music via BT