Hey. I'm installing a system in the new car. Only thing is i'm keeping the install on a budget and for now I've decided to keep the OEM stereo until I can fork the money for an aftermarket HU. Anyway, I am looking to use an OEM interface to get me two RCA outputs, one for the front speaker amp and another for the sub amp. Looking for something with a voltage output that is higher than 3V. Can anyone help me out? Or would it be better to just get an aftermarket HU?