I read @
www.sentra.net, that the timing on the GA16DE can be advanced up to 15 degrees, as long as you use premium fuel. It was said to give a 5-8 horse power gain, and was one of the easiest mods you could do. I asked one of my friends about it and they said something about turning the distributor cap. So the question is, is this correct and how do I go about doing this ?