I just install my little R in my car, which is plenty of bass for me. I have 500wmrs on it and honestly, wouldn't want much more. Anyways, it was the easiest wiring job I have ever done on any car. Only about 30 mins work.
1. 12V Power - Battery stock location is in trunk 2. Ground - Used ground on battery (no drilling) 3. RCA - Used stock HU so tapped into rear speaker wires to get the signal for the LOC for RCA's. 4. Remote - Fuse box is also there so I tapped into the fuse for the radio.
I couldn't believe how easy it was and the SQ is actually extremely good for being a stock HU. I have the upgraded system so I didn't want to take the stock out. That's all, I'm out.