I've heard pretty good things about the taylor wires. Only time I've ever had any plug ends pull off is when I've tried to take a plug wire off while they're still warm. I burnt a couple ends up on my firecore wires and just recrimped them with connectors/boots from napa. I didn't use any special spark plug crimping tool, just my regular electrical crimping tool and I have had no problems. I just made sure to properly strip the insulation to the core of the wire first.