So you guys are saying that if I hooked the metra harnesses up correctly(by their labeling of the wires) that they are in fact backwards? I just installed a pair of infinity's with an external crossover so I had to cut the connectors off anyway and plug them into the crossover. So I'll need to go back and cross the wires now? Metra's positive wire should hook up to the negative terminal?
Assuming you have the same metra harness that Grim posted earlier, then yes.
One important thing to mention, that should have been mentioned at the beginning: If you replaced all 4 speakers, as long as you did them all the same way, you're fine. There is no "correct/backwards" way, you just need all the speakers to be the same, otherwise they will be "out of phase" with eachother. So this affects the people who just replaced the front two speakers. If you have that same metra adapter, your front speakers will be out of phase with your rear.