I have the wires as well. I'd say don't get them for performance reasons - get them to give you engine some pop. I got red for my Impala for some contrast. For my GP, when I had them replaced I just had AC Delcos.
I got them for durability above other reasons. The stockers tore up as I took them off.
2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI
NAIOA moderator Still Imp'n, just in a different Imp.