I’ve got a couple of these husky 125B handheld blowers. Noticed pretty quickly the performance is a bit lackluster. It does have a catalytic muffler, also the outlet is around 1/4 inch round hole which is under the cover fastened with four screws. I will say I went a little overboard opening this muffler up but it makes a big difference in performance. The outlet cover needs to be reinstalled otherwise your gonna melt the plastic guard covering the muffler. Obviously the carb will need to be adjusted afterwards but well worth the effort in my opinion.