ok so i needed to change the plugs and wires on my 03 with 51,000 and i find that i have a screamin demon coil pack that i need specific wires for. Is this a stock svt part or did the previous owner install this? ford and my local parts dealers definatley didnt have them so i had to order them direct. so is this stock or is it an upgrade from what was in there and how is it an upgrade or down grade? what should my plug gap be also?