I was thinking along these same lines. I have a friend who is selling some Kicker 3 way 6x9s for a good price, but they are 4 ohm. Will they work with the factory Fosgate system. I have an 06 Crew Cab LE. I understand that most think the factory system isn't that nice, but its what we have and I cant afford to replace the whole system now. One piece at a time as money allows. Just would like some advice on if these speakers would work. Didn't mean to hijack a thread, but we're both looking for some advice from more knowledgeable people on here. Thanks.