Anybody here who would like to share anything about modified spark plugs? i received this message from my cellfon many times in the past. A certain Engr. Garong claims that it improves power and saves fuel. Ito ba yung binubutasan ng special tool ung tip ng spark plug? I need to be enlightened in this offer.

If he claims that his method works well by improving power and fuel efficiency, how come makers of spark plugs don't market it?