Contour Enthusiasts Group Archives Forums Modifications Zetec Maintenance underdrive pulley for zetec engine

I want to put one on my car but I also have a heavy pouding System in the car. Doesnt this pully reduce the RPM (Idle) of the car? Doesnt that also reduce the RPM on the alternator thus producing less power? I have two 200 Watt amps plus HeadUnit, EQ, plus 2 10" Bazooka tubes and Fog lights. This usually requires quite alot of power when they are all on at night time? Any problems with this and a pully installed?

Patel