Frankie,
You may not have ordered it, but you did indeed get the muffler designed for smoke. A non-smoke muffler has only one tap on the side of it. My best advise is to find a bolt that will screw into the smaller smoke tap and put it in to close up the hole. Then just fly the plane. Under no circumstances should you hook up the crankcase vent line to the muffler tap.

Ken