I have heard several diferent things about air filters. Some have said just remove the silencer and keep the stock box with a k & n and others say remove the silencer, air box, and install open element air filter- conical type. If I do conical type I don't know why I need to remove silencer although its not a hard job. Seems like I should just have to remove air box to make room for new filter. Anyway, I know that this isn't really a significant power gain but would like to know what most of you all have done. Its a speed density set up if that matters in this situation. Any info. would be much appreciated.