Plug Wires

Unless you are running points ignition and no radio, solid core wires can cause noise. Low resistance is available in suppression wires - that's not a problem these days.
Here's some measurements of different brands of wire. I have a few more to add one of these days.
http://www.heritech.org/cuda/ignite.html

Will wires boost performance? Probably not unless as stated above, things are deteriorated.