I have the JBA blue wires, fit nicely and don't rub on anything.
Jim

 

I too run Magnacores and have had no problems. I have had them on with my headers for about 2 years now. I did however bend all the plug boots at an angle to clear the headers better and have a loop twisted in the #7 to keep it from rubbing.

 

i've got the taylor thundervolt 50's. nice thick wire so they don't really flop around. boot fit is great on both ends. throttle response seems a little quicker too. just my .02