Just got these installed. What am i supposed to look for while i'm driving? Lower RPM pull?

 

A little more power. You won`t notice that much though.

 

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.