I'll try to keep this short. I bought a set of Accel ceramic for my race car. I thought they'd work well with my headers. I had to put the distributor ends on myself. The two longest wires intended for 5 & 7 were too short so I had to buy two additional wires at $28 each which by the way come with 5 foot tails. I got to the track and the car didn't seem to run as well as it should so I thought I'd meter all the new wires again. When I pulled them off, for the very first time, two of the ends came off and remained on the spark plug. Not the ends I made but the factory ends. The first time I talked to Holley customer service about the lengths, their reply was that they could not test their wires on every car and I'd have to buy two individual wires which I did. The second time they did give me a refund but I'm out the cost of the two individual wires. I ended up putting my trusty Firecore wires back on. Lesson learned.