I have 400 miles on the new filter. I took a girlie passenger for the first time last night. The low end throttle is a whole lot smoother and has more pep with the extra weight than before the mod with a passenger. The accelleration in the range of 50 - 110 mph is a whole lot quicker. From 110 to 132 it seems a tad labored than before... but, that might be that the increased roar FRIGHTENS! me! It is loud at the 5,000 RMP range. Soot: about 1/3 so far. Fuel economy: when I gas up today I will know, but I am at 200 miles on the odometer, and there are still two bars on the lcd fuel gauge. Starting out on a cold morning: the throttle response is smoother. The mod is definitely worth it so far.