First, new plugs and wires DO make a difference. I had a set of stock and Magnecor wires checked at a local Chrysler dealership. The stock wires showed anywhere from 1350 to 2000 ohms of resistance while the Magnecors were consistant at 208 ohms resistance. I know that Magnecores are advertised at 250 ohms but the Fluke used does not lie. Right there you are getting more "juice" to the plugs for a stronger spark. Stock plugs are designed for a very wide range of conditions and drivers (read grandma), not for performance. The Champion double platinums (gapped at.045") are more expensive, but will last longer, provide a hotter and more consistant spark through out the RPM range.
As long as you are in there I would recommend installing a Screamin Demon coil. It provides a very consistant 40,000 volt while the stock coil struggles to make a intermittent 36,000 and drops off sharply over 4000RPMs.
I installed all the above on my 2003 touring edition with 38,000 miles on it and realized an actual 2MPG increase and picked up nearly 7 MPH at the top end. My car would top out at 99MPH before the install and 106 after. This is with a full tank of fuel and the back seats installed.
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In closing, new wires, plugs and a good coil make a difference.
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2003 Black PT with ghost flames, Magnaflow exhaust, cold air intake, lowered, chromed and totally underpowered.
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