OEM Head Unit -> PAC LPHTY02 Harness -> PAC LPHEXT17 extension --> 4-ch amplifier --> PAC LPHEXT17 extension --> PAC LPHTY02 Harness
This gets the amplified signal back in to the stock wiring behind the head unit... case closed, no problems there.
I'm going to run a component set up front, so...
Non JBL - I've gone back and forth with using the Beat-Sonic amp due to the ease of installation, but I think I'll regret not going with a more "traditional" install. I'm having trouble sorting out what harnesses I need based on the following build:
Front Doors and Dash: 6.5" components...