I have two Hurricanes, one with a 2.4 and the other with a 3.2, both Brisons. I have not had any firewall problems at all but you have me worried. Can you give more details on the failure? Did the triangle blocks in the corners split? Did the factory fiberglassing over the triangles fail or separate from the firewall? How hard did you push the plane on the previous flights {I push mine VERY hard}? Can you post a picture of the separation?