Compressor before porting
 
 
 
 
 
 
 
 
 
 
 
 
 

After porting
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Now with the inlet plug in place.  It is just a heavy rubber piece I cut and pressed into the inlet and then trimmed smooth.  This not only plugs the port once used by the breather, but it keeps from adding any sort of flow restriction, as the open port would.