The statement was made basically that, "There could be no performance increase with 2 new plugs of the same heat range/gap!"
The fact is a performance increase can be had from one new plug to another depending on the motor and modifications. To simply state that this is not so is absurd!!! Put on a new copper plug with heat/gap same as a High Tech Plug like a Denso Iridium and there'll be definate advantages.
