There are many high quality wires to choose from, but I do like the Moroso low resistance ones. My favorites have been the Taylor low resistance Thundervolts. They hold up well too. Good wires aren't cheap though. One thhing I was told by both the Taylor and the MSD guys is to not overlook the coil wire. It is the one that gets beat up and will most likely need changing out more often than the plug wires. Especially with the high voltage MSD type ignitions. I don't know about any real hp gains. In my opinion if you cheap out on wires, I figure you are more likely to chase ignition problems when you least expect it.
I am sure there is someone who can calc the difference in tire size, but I think bigger is good if you can cut a light with them and in my case with a Chevy 2, still turn the wheel enough to make the turn off the track!
