Spark plug gap with MAD 6AL

The wider the gap, the more stress you put on cap, rotor, wires. That spark is looking for an easy path to ground, and if it can punch a hole through the rotor easier than it can jump a plug, it will. In other words, there is a practical limit to the benefits of a wider gap. I would not go over .040-45, just personally. That's inches, not metric