Amp bypass harness?
 

What solutions exist to bypass the amp? All I have found is a $80 harness for the head unit to RCA. Is there a harness that bypasses the amp out harness?

How can I hook up a head unit and bypass the the stock amp without splicing all the wires?

Non tech - Honda "premium" audio

An LOC or an amp that accepts balanced inputs is the only solution. If you don't want to splice or solder wires then an LOC is the way to go for you as it is truly the easier of the two solutions. I tried both ways and the best results for sound quality were soldering RCA plugs onto the leads and plugging into an amplifier the accepted the balanced signal. Good luck.