I can't comment on the Pertronix plug wires, but the coil is slightly larger than stock. It looks and works excellent, but you have to open the factory clamp a little more to get it to fit in. I can't praise the Pertronix Igniter III enough. You'd be hard pressed to tell it's installed externally if you hide the relay, that you really should run, well. It works excellent and adds an adjustable rev limiter.