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U supposed to notice that your A/C wont Work HALF as good :-).
Ha ha... I had UPDs on my old 5.0 and they worked great. I used the same brand UDPs on my last 4.6 and it sucked. My battery never charged and would die if I was idling too long. In the New Jersey winter while warming my car up in the morning, it would sometimes die and I would have to jump it. And my AC definetly sucked while idling or low RPMs. Maybe it was just the car, but I know I won't use them again.