I want to build a frame for our next Formula Student vehicle. I have found a really good model of a Honda CBR600RR engine. The problem is that the original model has a stock airbox on top of it which we don't need as we are going to design our own intake manifold. Since it is an imported model, I tried running featureworks on it but it shows that some of the surfaces are not supported by featureworks. Is there another way around on how to delete the airbox on top? I have highlighted the airbox with the section view.