The dust coming out the front is from the turbulence created by the solid rotor. The OEM cylinder let the dust flow through it and did not create such a fan affect. You might be able to help yourselves some by putting a rubber curtain over the top of the header opening. You can make it yourselves or ask your dealer to sift through his bone pile for an R series spreader curtain. You can cut off the bad part and use the rest. The R series has a rubber curtain (optional) for the header that really helps to hold the dust down. The Sunnybrook cylinder in an N or R series machine did not have a dust problem as the rotor is so far back in there and the dust has more places to go like through an open cage. Kelly