When it comes to mufflers, a lot of people base the power on how it sounds. When you hear a loud vehicle coming from up the road, you assume it is made of power because of how loud the muffler is or even how big it is.     This may all be the ploy of some advertising campaign and may really have nothing to do with providing a great amount of power at all. It is up to you to know the differences in what you are getting yourself into and to better understand the parts and the science behind them.