I have a '95 Infiniti G20 and I just bought a Kenwood KDC-142MP Head unit for it. I have the correct wiring harness and antenna adapter, but my OEM system is amped (got two in the trunk) and the wiring harness has 4 RCAs for pre-outs. The Kenwood only accepts one pair of RCAs for a subwoofer (which I dont care for). Can I just cut off the RCAs and wire those up to the Kenwood harness, or do I need another HU that has pre-outs for the front and back speakers?

Note: Getting rid of the Kenwood is no problem, I have another car that needs one just as badly and would work fine.